DIY Doctor

Lintel advice please for ground floor window

Postby VwBrian » Wed May 20, 2020 7:23 pm

Hello, I've started a little project opening up an external ground floor wall to put a window in. The house is 1930s so got them dense heavy bricks, it's a cavity wall so need to open up both skins, the opening I've made is 850mm wide and I've used a 1200mm prestressed reinforced concrete lintel from b&q which gives me the suggested 150mm end bearings. However, since getting the lintel in I'm now question if I've used the right lintel to deal with the weight of the wall above. Any advice, guidance or suggestions would be very much appreciated as I'm freaking myself out a bit now that I should have used a bigger lintel or an RSJ.
VwBrian
Rank: Apprentice
Progress to next rank:
0%
Posts: 5
Joined: Wed May 20, 2020 6:26 pm


Sponsor

DIY asbestos test kits

Postby stoneyboy » Thu May 21, 2020 9:15 pm

Hi vwbrian
Provided there are no joists for the first floor buried in the wall above your new opening you should be ok. You will still need to fit an external lintel
Regards S
stoneyboy
Rank: Project Manager
Posts: 3085
Joined: Wed Dec 10, 2008 6:44 pm


Postby VwBrian » Fri May 22, 2020 7:23 am

Thanks Stoneboy for the response, can I ask why that would matter and how I'd know?
VwBrian
Rank: Apprentice
Progress to next rank:
0%
Posts: 5
Joined: Wed May 20, 2020 6:26 pm


Postby stoneyboy » Fri May 22, 2020 9:45 am

Hi vwbrian,
Go upstairs and look at the floor - you may need to pull back floor covering. the direction of your floorboards will be at 90 degrees to your joists. If you have a boarded floor look for the line of fixings which will be along the joists.
Joists are a point loading so you do not want one directly above your new opening, PCC lintels are not designed for this application. Add to this the age of your property which could mean that your brickwork is laid with a weaker mortar so normal arch support does not apply.
Regards S
stoneyboy
Rank: Project Manager
Posts: 3085
Joined: Wed Dec 10, 2008 6:44 pm


Postby VwBrian » Fri May 22, 2020 12:59 pm

Gotcha, so supposing there is, what might be the solution? Or is it brick the hole back up?
VwBrian
Rank: Apprentice
Progress to next rank:
0%
Posts: 5
Joined: Wed May 20, 2020 6:26 pm


Postby VwBrian » Fri May 22, 2020 4:30 pm

Hi Stoneboy thanks again for the response, what might be the solution if I have got a joist above, a specific lintel or forget it brick it back up?
VwBrian
Rank: Apprentice
Progress to next rank:
0%
Posts: 5
Joined: Wed May 20, 2020 6:26 pm


Postby VwBrian » Fri May 22, 2020 5:52 pm

Sorry Stoneboy, wasn't being impatient, the first of the last two posts wasn't showing when I posted the second one. I've checked and the floor boards are running 90degrees to the wall so guessing my joists must run parallel to the wall with the lintel.
Anything else I should consider?
VwBrian
Rank: Apprentice
Progress to next rank:
0%
Posts: 5
Joined: Wed May 20, 2020 6:26 pm


Postby stoneyboy » Fri May 22, 2020 10:09 pm

Hi vwbrian,
No, you should be ok but don't forget to incorporate some form of cavity tray over the window itself.
Regards S
stoneyboy
Rank: Project Manager
Posts: 3085
Joined: Wed Dec 10, 2008 6:44 pm


Postby PA Surveyors » Sat May 23, 2020 12:06 am

The cavity tray should help prevent water resting on the window frame within the inner cavity. You would also need weep holes.

Although a cavity tray can be difficult to retrospectively install. As long as the external walls are in good condition then water should get in the cavity in the first place!
PA Surveyors
Rank: Labourer
Progress to next rank:
0%
Posts: 1
Joined: Wed May 06, 2020 11:06 pm



Display posts from previous
Sort by
Order by



  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!


 
  • Related Topics