dpm

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...

Hi. We are building an extension and laying new floors inside the existing house as well. We are managing the job ourselves, but seems like we are making lots of mistakes, relying on "specialists" trades instead of doing our own research to get the right solutions. I know we got it wrong, so...

Hi, More for my understanding and planning right now, but my wraparound extention is set to have a box frame steel beam running below the floor (where the wall will come down), right down the middle of the room which will be encased in 100mm concrete. My question is, can the top of that...

Hi All! First time post but have been a long time reader of the forum. I bought my first property in 2020 which is a 1970's maisonette which includes a single garage which is one of the middle garages in a row of 4. Last winter and whenever there is heavy rainfall the garage becomes damp as...

I am currently renovating my kitchen and am looking for some advice in how to screed over a cavity. A section of the old screed layer has broken up around the edge of the patio door threshold. At the moment, there is a dpm under the patio door overlapping the cavity and meeting the main dpc...

I have a timber frame structure mounted on concrete blocks around the perimeter, which are bedded on a concrete base.The concrete base has a membrane but is cut off flush. as i'm doing a solid floor inc Ufh made up of 150mm celotex , a seperation layer then UFH stapled on top , before a 75mm...

It seems that previous attempts to waterproof the first few courses of brickwork on our outside walls was done with Blackjack paint. Reading up on the stuff it doesn't say for use in masonry. It's neees another coat so I was thinking of just using the same again, I'm not sure how breathable it...

I am trying to convert my Victorian out building into a summer house / gym. The floor is brick and very damp but also has a slope of about 7cm across 3.5m it is also very uneven. I have already put a DPC into the walls and now I need to damp proof and level the floor. Should I: 1) flatten the...