Windows & Door fitting

How to deal with a gap between back door window frame and wooden floorboards?

Anonymous user 09/03/2024 - 3.31 PM

Hello We moved into a newly renovated property in the summer. Part of the renovation was a kitchen extension to the back and they put in double doors to the garden which consist of 4 panels across the back of the house: 1 window, a double door that opens out, and another window. This is approx 4m wide. We've recently discovered that the window frame doesn't sit flush with the suspended timber floor. The bricks below the frame on the outside are one brick thick. Two of these bricks are airbricks. So now we have not only an extremely draughty back door because there is no insulation between the room and the outdoor bricks thanks to this gap between the frame, we also are having water get in through the airbricks that is causing the wooden floorboards to become damp. The airbricks are at ground level (as the window frame is 1 brick above the ground) but there is an ACO drain fitted about 3cm out from the wall. We've had a few people out to look at it but nobody seems to know what to do. The extension got building regs sign off but I can't imagine this is up to code? Does anyone here have ideas on what to do? We have about 1m either side of the window which is still the back wall - can we move the airbricks sidewards so that they aren't under the gap in the door, or is the airbrick useless if facing into a wall? We are thinking about covering the airbrick on the outside with a ventilated cover that will allow air in but not rain water and then putting some filler between the floorboard and the frame to block the draught. Any suggestions will be gratefully received, thank you! Sarah ****UPDATE**** We eventually noticed that the cill was not sealed on the outside (and also not angled down) so water ingress likely coming from this. Sealed the cill with silicone, put expanding foam under the gap on the inside (trying to avoid putting too much next to the airbricks) and currently trying to figure out how to do something with some trim on the inside as the gap is uneven across the floor and only c.10mm thick at the widest point. Thanks everyone for the different suggestions!! :)