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Please can anyone help? I need to select a boiler for a semi-detached house conversion in London to supply hot water and underfloor water heating over three floors: 200m2, 100m2 and 90m2. The house has been brought up towards current building regs for thermal insulation and it will be...

We need to compact crushed brick for our 200 m2 ground floor sub-base which will be 150 mm deep. Would the Evolution Hulk 2.4hp Petrol Powered Compaction Plate be good enough to do the job? It has a claimed 10kN compacting force. We can buy one of these cheaper than the cost of multiple...

We will be laying a concrete ground floor, approx 200m2, inside a refurbished and extended house that will be a meditation centre and world peace cafe in London NW11. We've got old masonry - concrete and bricks - that we can either pay to have taken away or recycle ourselves with a concrete...

I need to cut about 1 metre off a steel beam 203x203UC46. The flanges are 11mm thick and the web is 7.2mm thick. Can a 9 inch angle grinder do it? Grateful for any advice.

I'm going to lay a concrete floor inside a large house. It will be approx 200m2 in two sections of 100m2 joined by two interconnecting doorways. My idea is DPM, 150mm concrete slab with 6 or 8mm diameter mesh mid-level, 120mm celotex or similar, vapour barrier, 50mm liquid screed enclosing CH...

What size timber ceiling joists do I need for 4.5m span at 400mm centres, please? The joists will support two layers of 12.5mm Soundbloc plasterboard, and nothing else, apart from themselves. There will be no load imposed from above, i.e. no floor supported by the ceiling joists - I want to...

We are making a flat roof ground floor extension 4.5m x 6.4m and I would like to use roof joists no deeper than 175mm because there are height issues. Would doubled 47x175 joists connected together with double sided toothed connectors be suitable for the 4.5m span? Would such doubled up...

Are jiffy hangers ok for use on masonry or do I have to persuade my builder to replace them with angled heavy duty hangers cut into the masonry? He's put about 12 screws into the wall for each hanger. He's only just started installing the jiffy hangers so it shouldn't be too bad to take them...

Hello, this is my first post. What screws do I need for a ground floor flat roof in a sheltered location, please? The construction is 47x175 joists at 400mm centres with joist hangers on one side and 75x100 wall plate the other. Firrings are 50mm to nothing over 3.2m (at side of house)...