dpm

Hi all, I have a question regarding retrofitting services when concrete floors have already been laid (water, elec, gas). I am undertaking some works on a partially completed barn conversion. The floors have been laid (MOT, DPM, insulation, concrete slab), but no service ducts were installed...

Hello I am currently converting my garage to a games room. The external wall side, i will be putting in a timber frame then sliding in PIR insulation... However, as for the floor, it is a concrete slab. I will be laying the DPM then insulation.... I am confused to which step to take...

Hi, Im doing 3m x 5m steel shed base in 2 stages Stage 1 was strip foundation. Shed was put, now I want to pour floor inside. I imagined I will lay out DPM and tape up against the walls and pour concrete over. The problem I have is metal shed profile. Its hollow inside and 45mm high which I...

I have a utility room with a concrete floor. When it rains I've noticed the floor gets wet. Right outside this room are two drains - one is for the kitchen sink and boiler/washing machine waste trap and the other is for the guttering drain pipe from the utility room. There is also another hole...

Could I get your thoughts? Two years ago, a contractor completed phase 1 of my renovation, creating a passage to an annex. This resulted with a 7cm step down. I now plan to raise the floor level but noticed efflorescence on the concrete at the patio doors. Can I use a Bituthene layer to close...

I live in a 1920’s semi-detached house with solid walls. As we’ve moved into winter/wetter weather I’ve noticed a tide line beginning to appear on part of the hallway wall leading to the stairs. The other half of the hallway closer to the front door does not have this issue. We have also...

Good morning, I am looking for some advice regarding my proposed solution to repair a 1920's concrete floor. The internal concrete floor is about 2 courses above the DPC. Consequently, the DPC was being bridged causing damp. I have dug a 6" trench around the perimeter of the room, to...

Hi all, hoping to get some help with a damp problem with a flat roofed extension. The damp is coming up through the floor board. I think it is a beam and block construction. I cut a hole in the floor board to have a look and found the concrete under the dpm to be very rough, possibly puncturing...

So I got a single skin outhouse with a dpm below concrete and I’ve tanked it for good mesure. Plan was to 2x1 batten out walls at 400mm apart with a dpm strip behind & not touch the floor with them. Then 50mm PIR celotex over the top to create a small cavity (taping joints) then foil back...

Hi, In need of a bit of advice or guidance regarding the possible need for damp proofing to an existing external wall that now becomes an internal wall after an extension. I plan to keep it as exposed brickwork as attached visual. The problem (or maybe it's not a problem) I have is the new...

Someone mentioned to me that you could build above the external Damp Proof Course (DPC) as long as you protected it with a membrane Damp Proof Membrane (DPM). Im not convinced and think this will cause issues long term and wanted some other peoples thoughts on the matter ? Please see below...

Had some building work done last year include new French doors. Have been saving up some more £££ to finish the room. This winter I’ve noticed a patch of efflorescence. It didn’t happen last year. Seems a bit odd. Are there any immediate actions I should take? The second photo is under that...

Hello, I am designing my detached garage conversion, it’s a single skin brick building on a solid raft slab. I’ve had a look on multiple previous posts and cannot find a specific answer. I’ve post here and in the ‘building’ forum, not sure which is best. I am need of advice at the wall/floor...

Hello, I am designing my detached garage conversion, it’s a single skin brick building on a solid raft slab. I’ve had a look on multiple previous posts and cannot find a specific answer. I am need of advice at the wall/floor junction to ensure I do not get damp issues. My design is largely...

My living room is on ground floor. It has a suspended wooden floor over a large vented cavity (several feet deep). It gets pretty cold in winter. I want to get carpet in this room; both for comfort and to increase the warmth/insulation in the colder months. I’m aware that doing under-floor...

Any advice on the below? We are renovating our house and found a very damp inside corner of an external wall, where the original wall of the house was knocked through to a single storey extension. You can see in the photo the wider footing of the house. Our builder thinks this is because the...

Hi, confident DIYer but never done something like this before... we've recently had our conservatory upgraded with a solid lightweight roof and new frame and glazing and built up the existing dwarf wall to full height (block and Brock with cavity) adjacent to the neighbours (previously just...

Hi All, I'm planning to build a summer house at the end of my garden up to the boundary, with rough dimensions of 7.5m x 3.5m, flat warm roof. Plan to use the space all year round as an office though will also house gym equipment and therefore am looking to maximise the head height for over...

Any help on this would be most appreciated; I have spent the past couple of weeks scouring the internet for a definitive answer on how to best finish the DPM on a concrete slab/plinth prior to the workshop being constructed this coming Monday. Base is exact size to match the wooden workshop as...

I am somewhat out of my depth with a house renovation and would massively appreciate some advice regarding the kitchen floor... There has been subsidence at some point in the house and the concrete kitchen floor was uneven to the tune of around 50mm from high end to low end. I ripped off the...