Write a review. So the ops 1. New-to-DIY likes this. . i am planning on rebuilding a calssic car and would like to make this a single opening door. Without doing research into current regulations, based on my experience alone I’d suggest you will definitely need a 600mm lintel and with a cavity tray and weep vents above. Want some proper acrows supporting that lot, also lintel need a minimum bearing of 150mm each end. PJ Wales Member. Remove loose paint and wire brush lintel, then dust down. rogerk101, Jul 1, 2020. It’s a cavity wall construction with block internal walls and brick external with timber rafters spanning the width of the building topped with concrete roof tiles. if 1200mm or less, 100mm bearing is sufficient, if greater than 1200mm, 150mm minimum bearing required. Delivery 7 days a week. Many thanks - JED. Step 3 - Remove center prop and fill with mortar repeat for props left and right, wait 5 days. Hello. VAT) Supreme Prestressed Textured Concrete Lintel 100 x 100 x 1050 S10. Could i chase the lintel for some pvc capping or. S Builders, Oct 12, 2008. Don't use a disc cutter: you will fill the house with dust in nothing flat and SWMBO will get seriously stressed. Support bracket for removal of internal chimney breast. D. You need to get yourself at least two, maybe three acrows with strongboy head attachments and slot the strongboys under the dodgy blocks then fit the acrow props on top of a plank of wood to spread the load distribution, then jam the acrows under the strongboys and. Roughly speaking do you think a H. tomplum Active Member. 8m) Rather more than a rotten piece of timber strength of not much more than 0kN/m,. 99 Inc Vat Click & Collect Delivery OX Trade XL-10 Masonry Segmented Diamond Blade 115mm x 22. Mix up like a regular powdered filler. additional dead weight = 145. Galintel 75mm x 10mm x 1600mm Galvanised Flat Lintel Flat. #6. pdf (stressline. I am building that wall up by one block so I could just lay the lintel on that but that would be 100mm not 150mm at each end. Therefore this padstone doubles the area of the steel's footprint. Without doing research into current regulations, based on my experience alone I’d suggest you will definitely need a 600mm lintel and with a cavity tray and weep vents above. I have. IMG_1762 (Large). sospan Screwfix Select. Notnowvicar Screwfix Select. You will need a lintel calculated for the new length. 2 = 4. exbg Screwfix Select. ChrisLong Member. The problem is at present the existing concrete lintel needs to be either replaced or the load 600-800mm of blockwork above plus some weight of the floor supported by in effect extending the length of the. This was more common on brickwork that was n't seen, and obviously when it was seen, the more traditional decorative arch was used directly above the opening. It is unacceptable to screw two thin lengths of wood together to make a thicker piece and call it a lintel- 'it is not appropriate to the stresses involved'. Hi, I'm looking to put in a garage door in an existing double brick wall with a 2600mm opening. If i use a catnic lintel then you will be able to see the underside of the lintel rather than the stone head. KIAB , Feb 22, 2019 #4I m planning on replacing some old single glazed windows in my house with new uPVC double glazed units. . All you see is the steel lip and then the bricks. That would be plenty to go under it and still leave you about 80 - 55mm of lintel to put the acrows onto. Cut a few holes in the wall and slide in some needles and jack the needles across the upper edge of the opening - Next cut a timber the width and depth of the opening and jack it in place below the opening and whack out the rotten timber. Masonry load above (standard Catnic lintel) 2700mm span. When I insert the lintel is it best to:-. 3 high, max 4 metre to apex roof. The distance from the internal lintel to front of bricks is 90mm. Anyway, because of the positioning of the lintel, I needed to trim down the bricks to fit. More importantly, a solid concrete lintel crossing the cavity is a bad detail for cold bridging and damp. I use a 4mm cobalt bit from the competition (you get a pack of two for a few pence). Wooden lintels work just fine - unless you render the outside of your house with Portland cement. 23mm (517HR) (1) compare For Angle Grinders Sabrefix Gallows Brackets Galvanised Hot Dipped 490mm x 50mm 2 Pack. 8m (wall is 3m) and need to support the roof (7×2 joists 18mm osb) but dont have the room for a rsj because of the 2. . Screwfix Community Forum. We want to install a Lintel which spans the whole of the rear of the house so we don't end up with pillars on the wall which separates the. The material from which the windows are made has no influence on the strength of a lintel. 4. Would a 100 x 65 lintel be sufficient given that there is very little weight above or should I go bigger. Hi Jitender. 2,The bricks should be on a bed not right on lintel (but only at the front of the lintel) 3,Depends on the condition of the lintel if it seems ok leave it in fit new window rake out and re point. New Member. Discussion in ' Builders' Talk ' started by zak99, Apr 20, 2013 . Afternoon all I’m about to put a single skin lintel in above a window before putting patio doors in. The hole i want to make is 18 inch wide x 25 inch high in the inner leaf blockwork. Hi can anyone suggest how to fit upvc fascia board to this sandstone lintel i was thinking of just no more nails some sort of wooden subframe I've got. Builders Metalwork. A lintel works with the wall during construction and it is at this point when it is under maximum stress. If it's only 3 courses (9") would it not be prudent just to fit a upvc infill. I looked at the wall,at the end of the lintel and discovers it to be soft so upon pushing the plaster off,behind it was newspaper Which I pulled out and it left a. The first thing I noticed is maybe minor. 1. Special Order. Either dot and dab plasterboard to the reveals square to the window to narrow the gap, dot and dab plasterboard at an angle (my preferred choice) to the window and reveals, batten out the reveals and plasterboard, or wet plaster/render it, but you'll need lots of aapplications and it will take weeks to dry out fully. #1. I figure the lintel does not offer bearing to the bricks above. I myself would rebuild the left pier, right could be repaired, difficult to be accurate looking at a photo & not actually being there. If you haven't got much depth on the wall above window you may get away with using some 6mm board screwed to the front of the lintel so it doesn't stick proud of existing finish. Thanks. 6 x 0. Phil the Paver Screwfix Select If you are removing the door to leave an opening, then i would fit a concrete lintel in above the door frame before you remove it, and then plaster over it after. gangman New Member. The lintel more than likely would have been a separate timber lintel, you can still see the bearings where it sat or it could have been part of the frame with 4x2 horns extending into the brickwork. I got 4 painted steel lintels replaced at my house with galvanised ones. I've taken down the old mouldy plasterboard around this door to replace with a new energy efficient door and PIR then new plasterboard. Wooden windows were replaced with uPVC around 8 years ago and from what I read that may have contributed to the problem. The house is 1930s brick and original windows have steel frames set into a wooden frame with a soldier course above. The builder gave a fixed price quote. The smaller the drill bit. Screwfix Community Forum. 8kn. 2 = 2kN/m run of lintel so provided the lintel you are proposing quotes a Safe Working Load greater than this then all is good. #15. It is possible to span 3 metres easily with the correct lintel. 1/5. If you were to remove the plaster vertically, you will come across the actual lintel, which will be wider. Before i proceed - and make a bigger hole (50mm) - can anyone help me understand what might have been preventing the first pilot hole (i'm assuming some hidden lintel) just to help me picture what's embedded in the cavity and how best to position my larger hole to avoid it. forever i said! I'm hear all week! Major Mal Funxion, Jun 26, 2008 #1. The existing lintels in the garage above the doors are box lintels. Whereas the usual DPC in a brickwall is 150 cm above ground level in the diagram the lintel is sitting much further down and getting wet from both top and bottom. Above one of my windows is a crack going along what i presume is a concrete lintel, is this dangerous and. 2 = 2kN/m run of lintel so provided the lintel you are proposing quotes a Safe Working Load greater than this then all is good. Support 1 course above where catnic is going using props and strong boys, remove area where lintel is going, bed lintel in on mortar (level both ways obv) with at least 150mm overhang each side, prop lintel off brick below, build brick off lintel to meet upper course. Screwfix Community Forum. . I prefer Catnic as well, although I liked the old Catnic ones better. This coupled with the fact that the bedroom directly above has a very spongey and dipping floor (dips roughly in line with the window below) make me. And some on the lower floor if solid, would be a good idea with board spanning the floor joists at right angles. No no handy A bit like a standard brick, but a bit more of a hard bar steward! Compo on top of your lintel. you are asking a question that can not be answered over the net, a little stupid me thinks. Some info: The lintel length will be 1200mm (150mm overhang on each side) but not sure what height and depth to buy. It's a wall dividing two rooms & usually front & back, plus it's the mid way support for the 1st floor joists, & wall continues up & will divide two bedrooms, the wall then supports the bottom chord of the truss which the ceillings are fixed to. The lintel actually sits partially inside the box so it needs to come out, remember this when you get the lintel and when fitting it. The lintel has the same width as the PVCu sliding door. FREE next day delivery available, free collection in 1 minute. Yes it all may collapse down when you take out the old lintel especially if the load above has been big enough to cause the original damage, Try googling replacing lintel for more guidance, ( Unless you intend to takeout a triangular area of brickwork above the existing lintel so that there is no load actually acting on the lintel) Last edited. so a 140x100 is 140 high as concrete lintels only span a single leaf of bricks. Damn, not seen one of those for years. So such a short lintel does not normally carry the weight of the masonry etc. Is this possible?On this same wall there is also a bowing lintel above the window in the bottom right of the image which would need to be dealt with at the same time. The only outside work will be pointing the box if required when it is put back in, but that can be done from the inside. In the days before lintels, you will always see a relief arch about 4 courses above an opening. Its plasterboard initially but then a lintel presumably. My inner walls had timber lintels. 2m. sorted. There was a curtain rail already nailed in (by the original builder ~40 years ago most likely), about 3 inches above the top of the window, so would anywhere above that point be ok? I read that most curtains are added about 6 inches above the window so would that be a safer bet? This is my first time doing any household DIY so many thanks!Hi, I need a lintel for over a ground floor door opening, I'm moving the opening about 350mm to the side, above is 1 and 12 light block and the floor joists for a bedroom, every room upstairs is stud wall so nothing other than the joists and blocks need support, the doorway is into the garage and was put in long after the house was built, and. beam direct onto the brickwork. Buy Structural Fixings at Screwfix. 6m wide opening. 6m and 1x for some french doors opposite wall to the garage door at 2. BuilderMCR, Feb 12, 2014. However this only appears to work for some drill holes and not for others. As far as I can tell the lintel is just a relatively thin metal sheet. Rockwool stops the concrete touching the pipes and so provides a gap around them. The ‘crack’ in the lintel is actually just the decorative style. The thickness of the concrete lintel is 100mm x 65mm. Spot on. The brickwork opening size is 4755mm. And, the bricks above that lintel are going to likely fall oot too so will need rebuilding after the new lintel has been put in. Suits Screw Diameter. Busterhymen Active Member. Apparently the top piece of concrete is the lintel and it's being supported by the concrete posts and the sill so nobody is prepared to take out the sides and sill. Read the table on you link your 65mm lintel over a 2. 20mm at its most extreme and it’s pulled brickwork to the right the window, causing quite a lot of cracking. These usually need to be re-cut and a lintel put in, but this is a major disruption both internally and externally. I merely pointed out that there is usually more than ONE correct terminology for the same thing. Prevent heating of the drill bit by using water. Screwfix Community Forum. Hi Im running alarm cable to a door frame but there is a concrete lintel where above the door. Buy online & collect in hundreds of stores in as little as 1 minute! Free returns. One method of forming a lintel with soldiers and a cast insitu concrete inner lintel, was to fix wall ties into the joints of the soldiers and then cast the inner lintel. If there is a gap you can get a frame add-on/extension to fill the gap if you're keeping the existing frame. You can stitch drill out half a brick quite easily and the lintel will then be resting on good solid brickwork. Discussion in ' Builders' Talk ' started by Andrew De'ath, May 26, 2020 . #2. Above the garage door will be cladded with cement board rather than be load bearing like blocks. I going to go with CN71A (catnic), as it removes the need for two courses of bricks and is strong. #3. I've taken the chimney out in my house and whilst I was removing it found it was partly being supported by what I can only describe as a concrete lintel that is inserted into the party wall, presumably for counter leverage. This was more common on brickwork that was n't seen, and obviously when it was seen, the more traditional decorative arch was used directly above the opening. The lintel is bowing slightly in the middle (measured to be 12mm lower in the middle than at the edges). 6 mm. Use 75mm/3" screws, use a combination drill, a 6mm HSS twist drill bit to drill through the lintel, then a 6mm masonry bit or you may need a 6mm SDS bit with accompanying drill if the wall is concrete block as the normal masonry. Abrickie Screwfix Select From those photos, it looks like the it’s a very slight arch, which makes sense as there is no sign the original window sat forward in the outer skin of brickwork, if this is the case the arch needs rebuilding not a lintel inserting. You could use a self tapper if you're feeling especially technical but there really is no need, imo. #4. I am looking to put a concrete lintel above this which will support a single coarse of blocks and the flat roof. 2/ mortar up the 2 end bearings drop the lintel onto these then backfill the upper surface. Put the required lintel spec on a B&Q trade note pad. Discussion in 'Builders' Talk' started by foxer fc, Sep 9, 2023. ), with virtually no risk of the bricks above moving. The Tech Spec for the lintel states: "As the brickwork mortar matures, lintels of over 1200mm spans should be propped at 1200mm centres. The bricks are probably over-hanging the lintel edges so you can't see anything. 4. All the same to me '. When lintels were cast insitu the steel was put in the bottom as this was in tension. com. I’m about to put a new opening in my 1960’s bungalow for a new window. I have seen people use angle iron. Im after an opinion on the attached photo. When he finally turned up on site, he said the existing lintel wasn’t big enough and we’d need a new lintel. Home Forums > Screwfix Community Forum > Builders' Talk > Lintels. stuart44 Screwfix Select. Infill insulation and plasterboard. S Builders New Member. You stated that you didn't know the correct terminology. 5kn. I've fit new french doors, uPVC ones. Finally with 100 bricks and a 215 wide wall you only have 100 left for the lintel beam. Home Forums > Screwfix Community Forum > Builders' Talk > lintel above window. They would be cracking or sagging by now if the lintels aren't enough. etc. 5 metre joist ends for a bedroom, whoever put the doorway in just cut the. So ref your other post about the steel, it has to carry. The correct way is to butter the top of the Lintel/RSJ/Beam with a decent mortar mix say 4 to 1 sand/cement, then carefully lift it into position and have a third pair of hands pinching the acrows up until they’re nice and tight, not too tight though otherwise you’ll start disturbing brickwork up above, then jam slate or. The stone lintel could be removed and repaired with threaded rods through from left to right, tighten the nuts and pull the lintel back together, re fit the lintel as decoration only. Cut a slot with an angle grinder with diamond blade. Remove the windows and put a Catnic steel lintel in place making sure that there will be enough support on the left and right. May be tricker if you have a 'soldier' brick. Danblez New Member. The wall is very cold to touch during the. In the days before lintels, you will always see a relief arch about 4 courses above an opening. Use either lintel or angle iron between brackets. 5cm long, I already had a 120cm long lintel that came with the house but would rather buy the best I can and get as much lintel on the bricks as possible. #2. My problem is a long concrete/stone lintel sitting above old metal window and ill fitting wooden door to workshop part of the building. I can’t find one anywhere though!. I now need to fill this gap ensuring the wall above is supported and tidy enough to keep the building. Or if you have some money rent one from a local rental place (cheaper than the chains). I would Get it surveyed. I am building a concrete workshop which will have a doorway 1. Even composite ones with a single bar in the centre or neutral plane can have a rough top as a key for the brickwork. As you can see there are 2 damaged aerated blocks on the inner leaf and one damaged on the outer leaf underneath the 150mm bearing of the lintel. Its a 1930's house - not sure when cavities came in. Smart™ Galvanised Steel Angle | 150mm x 100mm x 12mm. Last edited: Aug 29, 2023. Lintels are designed to support masonry above an opening, whether it be filled with a window, door frame or nothing at all. Or hire a builder for a day. Use either lintel or angle iron between brackets. The Tech Spec for the lintel states: "As the brickwork mortar matures, lintels of over 1200mm spans should be propped at 1200mm centres. Upstirs windows were fine as the lintel in the. I am currently rendering my 1930 semi detatched home. #11. Severntrent Screwfix Select Load acting on lintel is basically the weight of a 45 degree triangular wedge of brickwork acting from above the opening, Assuming a 800mm opening and weight of 100mm thick brickwork being 200kg/m2 the load on lintel= 0. If you’ve got a brand new drill bit, you’ll find it quick and easy. Bigger window and lintel replacement. The ingoing edge nearing the ceiling hit a metal lintel some 3 foot or so into the garage. This will prevent the stones from falling away when they're disturbed. CGN Screwfix Select. 1. Drill hole- fix bracket with a twin thread 4. Galvanised, mild steel. You can then remove the infill below back to the opening and rebuild properly. The bricks are 102mm, the lintol shelf is 96mm. The timber lintel above the rear bedroom window is particularly undersized, and has bowed. Google “ Welsh arch” , and no you don’t need a lintel. With concrete up top, a prestressed concrete lintel would not look out of place. Easy to use by filling hole with the mix and adding water, no manual mixing required. The fact that you have wooden lintels suggests that your house was constructed before WW2, in which case, it will have used lime mortar for the brickwork. D. The both garages of both houses are in the mid part. #5. For guidance catnic do give all lintel sizes and spans for different beams on their website. Use the smallest bit to drill a pilot hole and work your way up to your required size. multiply by a FoS of 1. It might be possible to put the doors in with no lintel IF the door header was thick enough. #6. Break out the lintel with a kango in pieces. stevie22 Screwfix Select. £23. FREE next day delivery available, free collection in 1 minute. I usually use 20mm stones , sand and cement (2, 2, 1) If you make strong formwork with say 18mm plywood with support behind the stones will just disappear into the mix. Current lintel fitted i think is 300mm x 90 mm concrete spanning both courses of brickwork. 20 DeWalt Straight Shank Combination Drill Bit Set 23 Pieces (4635K)The lintel is above a first floor glazing opening which is floor to ceiling height and spans 3. rogerk101, Feb 16, 2022. thanks for the advice about not needing a. So the lintel manufacturers are more likely the ones spreading such tosh. You could almost certainly neatly cut out the horizontal row of bricks immediately above your proposed door frame using your saw so's you can slip your lintel straight in (with a min 150mm overlap at each end - I think. Parts of cracked block have moved inwards into the room: the small piece I’ve labelled A has moved into the room by about 2mm, and the larger piece B has moved into the room by about. Morning, I need to buy a. Chang New Member. When you can feel that the drill in nearly through then stop and use your 5 or 5. tore81 Screwfix Select. Bed it in nicely, and allow the mortar to set for. Tamp it well down into the formwork to get rid of any voids. I intend to replace the conservatory, but just find that the mortar above the lintel has cracks causing like 3-5mm horizontal gap. Steve_11 New Member. Use either lintel or angle iron between brackets. This is a big RSJ steel lintel which has a plate welded to the bottom of it and so I am guessing it is approxinamely 10-12mm thick. 1/ spread mortar along its top surface, use a spare akro to wind it up into place (not too hard tho) then backfill the 2 bearing surfaces on either end. Morning, Any suggestions for fitting brackets where a lintel is in place? I am touching the steel after 15, 20mm. One method of forming a lintel with soldiers and a cast insitu concrete inner lintel, was to fix wall ties into the joints of the soldiers and then cast the inner lintel. back in 2016 I had windows and doors fitted. nutnut New Member. Abrickie Screwfix Select From those photos, it looks like the it’s a very slight arch, which makes sense as there is no sign the original window sat forward in the outer skin of brickwork, if this is the case the arch needs rebuilding not a lintel inserting. The lintel has failed at the end, you can see outside where the end has been patched up. Height and width will be 200 X 100mm. Screwfix Community Forum. Abrickie Screwfix Select. 1m lintel as per my report to knock down a load bearing wall. As you say the lintel is only holding 1 row of bricks so not supporting a very heavy load. " It just doesn't give any indication how mature the mortar should be before removing the props - that's why I posted my question. Hi All, New member so go easy I am thinking of converting my garage and putting Bi-Fold doors in the side. You should be able to take that lintel out without any collapse, but it's your call, if you want to put in some props first. Any ordinary DG plastic frame will do because The new window will not be supporting anything. It may have been cast in place and bars have gone rusty plus water got in it so it's cracked. I do believe there are no lintels. 01m to allow a UPVC exterior door to be installed in the entrance. " It just doesn't give any indication how mature the mortar should be before removing the props - that's why I posted my question. Choose from top trade brands. Richard_, Oct 5, 2019. I took the bricks out and put them back in (with the help of a bricky. Is an off the shelf ANG catnic lintel that can support uniform distribution of up to 7kN of weight enough to support a stone head going in above. The lintel is bowing slightly in the. As the top of the window will only. Click to expand. I was thinking about putting a bit of timber although that would need brackets (i was thinking of a wooden block) on the end verticals to support it and worried it might all be a bit ugly/bulky. Discussion in 'Builders' Talk' started by Judith Birkett, Nov 8, 2020. It looks OK, no rot. ) stacked on top of each other he. Will SF basic wood screws work fine or do I need to buy a specific type / brand? What's your preffered screw type /brand for fixing into lintels? Thanks. Supreme L04 Steel Reinforced Concrete Lintel - 100 x 65 x 1500mm. stuart44 Screwfix Select. Non composite are. J. 6kg required. Wayners Screwfix Select. I am planning to purchase a semi detached property, which has got 2 concrete lintels inside the integral-garage which supports the wall above. Hi Jitender. Our engineer specified a PCC lintel for use where the downstairs wall supports a glulam beam, that's in turn taking the upstairs floor joists. The ground floor is orignal 500mm thick singel skin walls with 2 windows which have old wooden lintels both windows under 1m. D. Notnowvicar, Feb 23, 2023. It's solid but I know rust eats through eventually which has scared me a little. For one row of breeze blocks and not loadbearing the header would need to be at least 4" high (and that means it would be about 4" high and about 5" wide). They were happy With my work until they received final bill. The spec of a lintel is almost entirely dependent on the span because in theory it doesn't matter how many floors worth of walls you build on top of the lintel. The lintel sounds hollow when tapped and doesn't seem to be any bricks above it - went into loft - no insulation above and just seems to be boards. Hausfix, Jun 13, 2022. I am looking to put a concrete lintel above this which will support a single coarse of blocks and the flat roof. A standard brick is 102mm wide. They are refusing to pay saying wrong lintel was put in and waiting for structural engineer to do his report. 17810219 UB @ 1100mm - Probably. The deviation is approx. 8m long to accommodate the other window. Whatever your steel lintel requirements are, we've got it. VAT) prestressed concrete lintel. yetanothermike Member. I would like to replace the lintels as it got a crack. There will be guidelines on Birtley's website: what else do. Pick a joint line and follow that. Is it OK to simple take out the steel and wood frames and replace with the PVC one or do I need to put a lintel of some. catnick,. Although I asked the builder, when building the shoulder for the new lintel to use the standard 'brick tie in method' (brick, half brick, brick, etc. I’ve got concerns about how the lintel has been supported. Most of the windows on the front of the home (though not all) have large gaps between the window and the steel lintel (up to 2. e. I plan to put L10 IG Steel Lintels in, with a span of 1500mm and 2400mm (includes 150mm overhang at each end) which will carry approx 2-3 courses of brick. We would like to show you a description here but the site won’t allow us. As you can see there is a metal lintel above the doorway and it’s bedded into the wall I’m not removing and also laid on top of the lintel for the other doorway. Then cutting out and removing old lintel/s, which will mean loosening course of bricks above. If it was my own place I wouldn't mind as I would remember to take the key out before opening. Prestressed concrete lintels are an excellent solution in providing economical and robust masonry support over door. Supreme L02 Steel Reinforced Concrete Lintel - 100 x 65 x. Option 1 - I take a loss on the window I bought, buy a smaller window that fits under the RSJ and somehow cover the RSJ with trim. We thought about putting a timber batten above the window on the inside wall, but the plaster and paint for the whole room is really uneven, so we're just trying to get some. The interior already has a concrete lintel in. My single story extension shed has had the lintel above the door entrance raised from 1. sospan Screwfix Select. #2. Post-fixing concrete suitable for all types of domestic fencing. And there is a wooden frame around the PVCu door frame. The brickwork is sound apart from the section between the door and window. £75. I was thinking about putting a bit of timber although that would need brackets (i was thinking of a wooden block) on the end verticals to support it and worried it might all be a bit ugly/bulky. This could be a very easy DIY job if that wall above the opening ain't holding the ceiling/floor joists up. If you hit the rebar in the lintel when drilling in to the concrete lintel, its integrity will be compromised. Then finish with mortar and leave the Acro's in overnight. When it is cold it is contracted leaving small gaps between the brick and the pointing for which rainwater can get into, when it is warm it is flushed with the bricks. I was thinking of buying a 8mm thick 70mm. I’m widening the door frames in my house to 76cm ones. stuart44 Screwfix Select. Mr. when i removed the old timber frame patio doors i noticed that there didn't appear to be a lintel on the outer brick wall, only a concrete one on the inner block wall. Yes you can fit a door there, yes you will need a lintel and yes you can reposition the strap or cut the majority off and fix the remaining to the four courses of bricks. The back of the lintol set back so the front of the infill bricks are too the line. When you use the key to unlock the door, if you leave the key in the lock and open the door the key hits on the lintel above and is prone to snap (as the carpenter found out).