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I wonder what they drain into ...

The concrete is ordered for delivery on Thursday. A last question: how should I deal with the cavities in the external walls up to DPC (floor level) at the doorways? I assume they have to be filled.

I'm intending to completely renew my driveway which is long enough for three cars in line, but very narrow, so I'm excavating about 1m to the side from a raised front lawn, and will build a small brick retaining wall. The nett addition to the driveway surface means that I will need PP unless I...

I have a new kitchen extension and I need to run a new water supply pipe to it, across my driveway and front garden, connecting to the existing 1/2" (not 15mm) copper pipe passing beneath a retaining garden wall adjacent to the pavement (where my water meter is situated). I'm intending to...

It's awkward, as I'm having a vaulted ceiling, but I suppose I could take the gas pipe around the base of the rafters, just above the wallplate, and leave a break in the 35mm insulation layer between the rafters & the plasterboard. I was going to run 28mm pipe from the meter to half way to the...

It does both, surely (if not in a permanently damp situation)? I'm going to lay continuous lengths of polypipe conduit pipe under the screed for water (and copper pipe with soldered joints for gas), so I'm hopeful that I won't have any maintenance issues.

Work on my extension (with heavy duty concrete foundations!) proceeds, and I'm trying to decide how to construct the internal floor. Posted separately in another forum: http://www.diynot.com/forums/floors-stairs-lofts/construction-of-ground-supported-floor.383585/

I'm about to lay the floor slab in my extension, and the area has been excavated, levelled and the sub-base formed with well broken brick & block debris, together with MOT 1 stone and sand blinding. I'm trying to decide which method of make up to finished screed will be best. Looking at...

Six inches was the prevailing standard at the time the house I'm extending was built (mid-1950s) and still was at the time its garage was added (late 1960s) and it is STILL the minimum standard required today. I can't see the point in accusing anyone of being an idiot or of being an amateur...

It depends on whether you are talking about the thickness of the concrete itself, or its depth in the ground. Part A Table 10 sets out the required dimensions of the foundation trench, but for strip foundations, the starting point is a minimum thickness of 150mm.

Having engaged a roofer, it seems like we're on the home stretch, but of course there's lots still to do. We've left the floor (not for idealogical reasons, but because bricklayers became available at short notice), but there are scaffold poles inside the footprint, so I still need to get...

How can it do both? if it's under the DPC, it goes no higher, let alone 250mm ...

I'm putting in a concrete/insulation/screed floor on a prepared sub-base and the bricklayers have already lapped a 600mm strip of DPM in with the DPC at what will be finished floor level. I've blinded the sub-floor with sand, and I'm nearly ready to have concrete poured over the DPM...

Nope, really not. One excluded the conservatory roof (but not its doors & windows), another excluded all the glazing, and the most expensive (by far) excluded doors, windows, wiring, plumbing, sanitary ware in the loo and a few other odds and ends as well. He wanted £57,500 + VAT for a shell...

This is how we connected the downstairs WC, with a rest bend and then an 87.5 degree bend before a short vertical fall via a swept tee into the main drain. Building Control were perfectly happy.

Here's the 2x50mm wallplate, lapped at a corner. Walls were almost perfectly square and were perfectly level. Chippie very complimentary. Now I just need to find a roofer. My only local interest is from a builder who wants to sub the job, take a fat margin and charge me VAT. There's no point...

We demolished an old garage at the side of the property, and it had been built at much the same time as your extension. It too had 6" (not 150mm, surely :wink: ) of concrete bedded on a bit (an inch?) of clinker, and that WAS the prevailing standard at the time, but it never failed, and even...

Brickwork finished yesterday. Measuring for the lean-to conservatory tomorrow: a glass roof sitting between the two walls, about 30cm lower than the tiled roof of the remainder, french doors with windows either side below. It's going to be quite nice, I think. I just need to clean all that...