dpc

The building regs say a DPM should be 1200 gauge - but what about DPC? The DPC's you buy in Toolstation and the like seem to be thicker than 1200 gauge, but what is the actual requirement? Could you use a sheet of DPM cut into strips as a DPC? - for example, as a cavity tray above a lintel...

Hi, I'm getting to the end of a renovation and the concrete floor screed has been laid. This is in a rear extension to the kitchen and also a new extension at the front. There is a gap of about 3 inches between the top of the floor and the DPC level, both at the front door and at the back...

Hi all, I hope you are well. I'll try to keep this short. I am building an outbuilding (hopefully to use as an office / gym). The size is approx. 7m by 4m. It is being built on the boundary so within 1m. I plan to build it all of the light breeze blocks (except two rows of bricks at the...

Evening All. This seems to be one of the few topics that the Internet does not contain endless chapter and verse on... and that information that is available is less than clear. I'm talking here about the vertical DPC at the join of a new cavity wall for a house extension to the existing cavity...

Hi there I recently bought my.house which is now showing a lot wrong with, I know I need to get the pointing done and the roof verge but have now discovered the drive drains into the side of the house, the bricks below dpc in one particular spot are saturated but not above, I am worried about...

Does the patio in this picture look ok? There's a strip of gravel between the slabs and the wall, but I think this is above the DPC; anything to be concerned about? I'm not sure where the DPC is tbh, or if having gravel above it is ok.

Hi all, hope you are well. We currently have an extension underway and it appears the dpm will be a good bit higher than the finished floor level (almost a block higher). I assume they have got this wrong due to sloping ground and having to add a cavity tray. The builder is no longer with us...

Hi, Is it ok to protect a DPC by chasing in lead one course above it and laying patio up to it? Any hints on how to do it? Landscaper has built a 120mm reinforced concrete raft for a patio to replace part of an existing patio (it's 3 ft above garden level but same level as kitchen). The raft...

Hi, I'm currently doing some work on the front garden to take the ground level below Dpc level and have removed paving slabs from the whole area. However after removing the ones in front of the front door, it's exposed the sub floor beneath the hallway. There's no outer brick skin present just...

Hi all, removing some skirtings we found injection holes, in a room which has damp problem. Was wondering if there is a known data when the (absurd) practice of injecting a DPC all started here in England, particularly South West?

I have a garage which is built with the walls sitting on the concrete slab, with a DPC at floor level, single skin brick. Parts of the walls are below ground, when it rains water seeps through the DPC. I've dug out and exposed one side and will cut back the DPC as close to the brick joint as...

Hi Guys, Any issues with placing 50mm xps insulation slabs externally in the trench below dpc/ground level before backfill? To help with insulating the building? Please see pics.

Hi Guys, I will be filling my cavity as per title over the weekend prior to backfilling and compacting the ground. I know i need to use 8 part balast to 1 part cement gfor the mix...but i have read conflicting messages about the consistency of the mix....should it be wet or dry? Also i have...

Hi All, We have had someone round to check an opening for PVCu doors and he recommended we take the course of bricks down a level. The builder has responded that he can’t go down a course of bricks as this would mean he is below the damp course of the building. However, this means there is a...

Good evening I am after a bit of advice regarding patio replacement and ground level if anyone would be kind enough to share their thoughts. I have owned this place for a couple of years now and I knew it was a project! Constructed in late 1970s and sold on 3 or 4 times. The original builders...

Single leaf breeze (not supporting). I dug a 100sq test hole in the ctr and found conc. below the screed so I figure using conc. blocks will be ok. Do internal walls require a dpc? I'm assuming it would be good practice to dig out a channel in the screed and block up off the concrete below...

The airbricks (2) at the front of the house are sightly above ground level. When it rains heavily it smells slightly musty in living room by the window (where the airbricks are). Wondering if rain is going under the house. if they're too low, what methods should be used to rectify it? Please see...

Hello I'm hoping to get any advice on new patio level and the DPC As shown in pictures the existing concrete patio sits 17cm below the DPC. I'm hoping to lay sandstone and a border of block paving on top of the existing concrete as shown below , patio has a slope running away from the...

Hi, I'm a new member but have been reading a lot of the great advice on here. I'm struggling to find information to help me move forward with my project...... I'm totally redesigning our back garden and have taken down a concrete garage, lifted a large block paving driveway and removed large...

Please, please help, clever and knowledgeable people. Sorry for the long story..in brief: Can you lower block and beam around an extension built on the block and beam? Can you remove the block and beam on the outside of a building built over the block and beam? In Oct 2018, builder built a...