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I have a new extension that I would like to join the drainpipe from into an existing underground soakway feed pipe (brown 100mm?). The extension downpipe is approx 60mm square, rather than try and fit a 45 degree join in the underground pipe to accept the new drainpipe, can a 'boss' be used for...

Hi, Currently building a ground floor extension and am now looking at fitting the electrics. I have an outside PIR light, that is now inside following the extension build. This light is connected to a switch that allows this light to be on all the time, or just PIR mode. The question is...

Hi, Just finished tiling the extension roof and am now looking at fitting the lead flashing. I've got code 4 lead, 300mm wide and need to fit this along the top abutment to the house, and then side sloping (18 degrees) abutment. From my research, fitting the top abutment looks quite...

Hi, Just fitted 3 velux P10 GGL windows to my extension and also have the EDW flashing kits to fit. I notice the (useless) instructions show shopping baskets for what looks like insulation and other kits. I plan on just fitting some 20mm celotex around the outside to replace the insulation...

ok, although I've posted some of this on another topic, this question better clarifies my query. I have a 18 degree lean to roof on my extension which I am struggling to complete due to the ventilation requirements. The construction at present consists of 7 inch joists from pitching plate...

Hi, I have a lean to roof on an extension I am building. The joists attach to the pitching plate and inside wall plate, but extend over the outside wall at the moment. As I want to finish the outside wall, I presume I cut back the joists to finish on the inside wall, and can then finish...

I'm just about to fit 3 new P10 velux windows to my single story extension and have looked into the fitting procedure. I've read about having to double up on the roof trusses around the velux windows, (either side, and top and bottom?) but as I have 7*2", this does seem a bit of an overkill? Is...

I have a single story extension with lean to roof and with a 3.6m opening for bifolding doors and plan on fitting 2 RSJ's across this span, 1 on each cavity wall. As I've never done this before can I check the installation procedure for this. - RSJ's will be about 4m in length, going to get...

I've got about 19 sq M to screed to a depth of approx 65mm and based on quotes of £250 (labour only) I am thinking of doing it myself, as I've already done everything else. My question is, is this a straightforward job, i.e get the levels/screeds right, mix the sharp sand, fibers, cement in a...

Hi, I have an area of approx 6m by 3m on a ground floor extension which is block and beam construction, that I now need to insulate and screed to finished floor height. I was planning on putting 1200g DPM down, then 80mm celotex insulation (taped at joints), then 65mm screed (approx 1.2m3)...

As part of my house extension, I have a set of patio doors being fitted. I have laid the first few courses of brickwork up to DPC level, however as my house has a 'feature' wall that includes a plinth course above the 1st five courses, setting the brickwork back, all the existing patio doors in...

Hi Just about to lay my B&B flooring and have a query over the DPC courses. The B&B floor will sit on 100mm internal cavity blockwork and I will be installing a DPC course between the B&B beams and the blockwork. The beams will run end to end from supporting wall to supporting wall. The sides...

Hi, Progessing with my house extension and am now looking at the RSJ needed to go above the 4M bi-folding doors we have planned. As this is all being completed under building regs, do I need to show a SE report for the RSJ spec. Also, has anyone fitted a RSJ recently for such a span, and...

Anyone know why you need to use a weak mix concrete 1:6 to fill between cavity walls on footings? only ask as I may need to use 3 aggregate blocks to get the width I need for my first few footings courses, thanks

Hi, Still working on the design for my extension. The footings have been poured (450mm wide). Now I'm looking at laying the first course of concrete blocks. I have the original house build drawings which state a 276mm cavity wall with 25mm wall insulation. As the first few courses of the...

Hi, Currently building an extension to my house which uses a hip/lip brick about 5 courses from DPC to 'indent' the wall, which then continues up. I need to know how to build the first few courses from footings up. I plan on laying 2 courses of concrete blocks, then 4 courses of red...

Hi, I've just replaced my Grundfos alpha heating pump and it has settings for constant or variable heating systems, but I have no idea what this means. I have a megaflow system and gas boiler, any ideas? thanks

Our Grundfos CH pump is making a pulsating noise with the green LED also dimming slightly at every pulse as it draws current, rather than running continuosly. I've seen someone else on here had a similar problem, but no answer. Does anyone know if this is a fault, or should operate this way. Its...