dpm

Hi Everyone, TLDR; How should a DPM in a new floor slab connect to the DPC in the walls? Does it seem like I should add a DPM to the walls based on the plastering we found? I'm trying to get my head around how the (rising damp) moisture management in my house should work. It's a 1930s semi...

Hi all, I am after some advice with regards to damp in my single skin detached garage. I have had a damp survey done and it confirmed that I have damp bridging into the existing concrete slab floor from the engineering bricks below the DPC. Apparently fairly common in garages. No visible signs...

Hi, So my builder left the slab exposed for 3-4 months after laying it (badly) on a vastly over running build. So now that roof is on its floor insulation time. Weve had heaters and 3 dehumidifiers running 12 hours a day and overnight sometimes. We scrub slab to remove dark mud, clay etc then a...

Hi everyone. I have a concrete slab floor in house, some wooden batons with inch of rigid insulation foam and then a DPM/vapour membrane ontop of it all and then tounge and groove floorboards resting ontop (floating) I need to replace a few meters of the DPM as it’s ripped from floor board...

Right, here we go.. I have a detached garage built in the sixties with a substantial plinth. The garage is now gone allowing me to have a good look at the plinth. It's square and has a depth of over 150mm. It's downside is that there's no DPM. The plan is to build a garden office on top of...

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...