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Starting building below DPC with what I thought were 7N fibolite, just got back from Jewsons and now been told they delivered wrong things (3.5N). I know I should have checked but blocks were wet and the strip of colour not visible. Are the 3.5Ns still ok, dont want to knock it down! Plus floor...

Hi all Ready to sort the DPM and DPC, was going to put the inner DPC under the DPM and run it down the blockwork 100mm so the DPM laps over it for width of block. The DPM has the concrete slab laid ready for insulation and screed. But have seen that it has been suggsted for the DPM to go...

Floor slab done, with a wall cavity of 100m looking at getting 85 insulation, but not sure what type to go for kingspan/celetox/knauf? Been looking at knauf but the slab standards seem to vary believe 32 or plus seems to be the best, has anybody selected the brand before any suggestions...

Hopefully this weekend will be creating/getting half way through the floor slab, here it goes. 150mm ish hardcore. 50mm ish blinding sand DPM 1200g overlapped with internal dpc. 80mm ish concrete. (Will insulation be needed at edge of concrete slab?) Then when set 100 insulation (if...

How about Thompsons water seal that do a similar job, but wall surface would be breathable?

Blocks across the sides was popular when I looked into it, but I marked on the house foundations the height and the sides of the ground and worked to those using wood plank and spirit level and floated across to top to help it out. All worked ok and was level.

synthaprufe lac, had look and would seem suitable for the junction of the membrane and wall below door would love to pull it off but its part of the upvc existing door all one part.

Been looking into hardcore for the floor slab, thinking of using concrete then the blind sand ready for the dpm. Have some ballast spare, but a reaction from chemical in the ground could cause damage (sulphates)? Has anybody else done this method?

Heard about a strong mix causing problems. For the dpc grinding out a few cms seems logical and then having a 100mm overhang for the internal for the floor slab dpm. The front door sits on top of the dpc, so where the floor slab dpm will join means a real lack of space even getting a bolster...

Stayed clear of those, did hear of the nightmares. How far did you go into your houses damp proof membrane course for your build? Ive heard of 100mm overlap to just place it next to it? That is some difference. Getting the grinder out and going through it does seem dodgy! Cheers

Have heard that! Well its started and the 7N fibolites have been used from foundations up. Have used a decent mix, blocks were damp and the work allowed to dry slowly. Hope it will stand the test of time! Looking at going with kooltherm cavity closer by kingspan, seem pretty good, slot and...

Didnt think of that! Have one window and door. Cavity closer are about £15 for a 2.4m length.

Doing a quick budget is leading to cavity closers being cheaper too plus less hassle of hanging a dpm.

About to put the DPM in along the block work and now considering how to return the inner skin to the outer for windows and doors. Cavity closers do seem the easier method of slotting in, but is returning the block work to the outer skin offer better options for flitting doors and windows...

Went for GEN 3, all well! But at the point of using wall starters and a little confused. I know they have to start above the DPC, one for each skin (double skin porch), using fibolite blocks so a tie in every block added. But how do you weather seal behind the starter? I assume you dont use a...

Thanks for all the advice, have now started! Concrete/old canopy is down and started the trenches. Was going to lay them in a day, but realistically not sure if I could so looking at getting it ready mixed, a quote today was £75 more than the materials to do. So very tempting, what grade of...

Looked into those, they are looking like the new choice, the shrinkage and less likely-hood to crack should mean a render that does not blow hopefully. The standard block size 440mm (L) x 215mm (H) x 100mm (W), will see if they are in smaller widths so internal space in porch is bigger. Thanks

Looking at using 440mm long x 215mm high x 100 wide 7n celcon blocks above and below dpm for both internal and external skins. Good choice I hope.

Sorry about the double post, my fault on entering it. The selection of the blockwork for the porch is proving tricky, or maybe over thinking it. Was going to use standard bricks up to dpm then outside skin dense blocks and inner skin aerated. But read that aerated blockwork could be used from...

Thanks, would it be a good idea to use a bricking sealing liquid, then paint the front of the house? Was going to paint house after. Was planning to use a cavity closer on the use block-work joining the house too, but they should be easier to fit, hopefully! Cheers