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I will shortly be insulating a new pitched roof (single storey kitchen extension) using between-and-under PIR insulation - 100mm Celotex between rafters, 50mm under. What is the best method of fixing the plasterboard to this afterwards? And how about the fixing of the 50mm Celotex - whats the...

I have a new combi now and am just refitting the house to have two showers. Flow rate will be a fairly big problem, especially with two showers running at once. My peak flow rate is 8.6 l/m, measured by my boiler with kitchen hot tap open. Looking for ways to boost flow rate. Hot water...

I've got a load of holes to drill through a cavity wall with rockwool insulation in the cavity. Every time I do this the wool winds itself round the bit and pulls it out from wherever it is placed. Is there a way to prevent this with SDS and/or core drills?

so I want to add UFH to my existing single-zone single-nest heating system, the nest is wired to my Combi via OpenTherm. I want to keep the OpenTherm if possible as it helps the boiler modulate for peak efficiency. It is not possible to chain nests together unless you use the dumb On/Off...

ive got a 32KW combi with 8 rads and am going to heat a large open plan extension with a wet UFH system (35 m2) Doing this DIY and I know nothing about heating engineering. My plumber, who is a decent heating engineer, mentioned I’d probably need a header on the UFH manifold so as to not upset...

My architect has drawn up plans for an extension, and I’ll be tackling some plumbing bits myself. There is a new utility room (sink+washing machine + boiler discharge) draining into an internal SVP, connected to the main drain. See pic: He has drawn a stub stack inside the utility room to...

Building a shed, roughly 12' x 8' (Aiming for something like 3660x2500). See plan: Questions: 1) Post spacing? Positioning ok on diagram, or need more? 2) Post depth? 3) Need full fill of Postcrete? That would be a hell of a lot - can I pack it / layer it with pea gravel or something? 4)...

As part of an extension I need to move my stairway 'forward' from where it currently is. I don't currently have enough headroom for this, so need to modify the first floor joists. So I need to cut into two main load bearing timbers, with an acrow prop taking the load. I will need to install a...

Making a concrete base for some brick/stone steps outside my front door. Need 50mm concrete on top of my compacted hardcore. Area roughly 2.8m x 1m. Worked it out as 28 pre-mixed bags (20kg bags). Are bags the right way to go or should I be buying bulk aggregate? (would prefer not as delivery...

Running an dlectric supply to the shed (not yet built) SWA required or pvc twin/earth inside conduit ok? How should the cable exit the main house and enter the ground/conduit? Looked for some photos of this bit of detailing but not found anything that much of a match for my situation yet

Currently building a shed and would like to run a water supply to it (plus electricity and network). I'm planning on routing some 20mm MDPE 750mm underground, rising up through the shed's concrete base (inside) terminating at a stop tap/adapter. My question is what to do at the house-side of...

I've started demolishing my fireplace (old open fire in 60s house) with the intention of rebuilding it using new bricks, wider than before. Here's a top-down section: I'd like to rebuild the inner skin of bricks 1 brick wider on each side, to accommodate a log burner. My worry is that I...

Found this white fibre stuff that looks like loft insulation in front of my fireplace grille: Is it safe to proceed with removal of fireplace, or have I got asbestos?

Looking to demolish my half of semi detached garage, to then build extension in its place (fully detached, about 6" in from boundary) Flat felt roof, shared ceiling joists spanning both garages, single skin brick wall separating garages. What will I likely need to do to make good the wall...

My architect has produced a nice design for our rear/side extension, however it depends on a 9m steel moment frame to support the existing back wall and new side bit. Anyone care to guesstimate the cost of this bit of the build? I suspect the horizontal beam(s?)will be quite large, they're...

Just designing the supplementary equipotential bonding in my bathroom. It contains the boiler in an airing cupboard within the bathroom, my plan was to bond all copper pipes together and to upstairs ring/lights circuits. Do I need to run a wire to the taps of the...

Struggling to come up with a sensible layout for the positions of my bathroom downlights. It's a 3x2 area with airing cupboard in corner. I've got 7 downlights. Picture says it all: Wanted a couple over the bath as it's a bit dark at the moment. Any ideas?

Could do with a quick sanity check on part of my rewire design. To run the upstairs ring / upstairs lighting I would like to re-use an existing boxed-off compartment that serves (copper) pipes to the boiler. There is enough room in this compartment to slide down a length of rectangular 'maxi'...

Is it better to wire all light fixtures sequentially in series, or is it acceptable practice to use JBs to create spurs? Specifically, if my bathroom downlights are served by a spur off a junction box in the upstairs light circuit, does that sound ok? As far as I can tell it may just make it...

I'm doing first fix for a rewire in my house and I've run a single 1.5mm cable from the CU to upstairs to serve all the lights on the floor. The circuit will serve 9 LED bulbs in the hallway/landing/loft plus 7-8 LED down lights in the bathroom. Total demand, even if they're all switched on...