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Hi all, I've celotex'd the walls of my room as well as taped all the joints with silver foil tape. The entire surface area of the room is silver. Is a green vapor barrier necessary?

Hello all Can anyone identify if this is mold or a left over of the manufacturing process of the OSB? Whilst fitting insulation board between my rafters I noticed my osb has some mold like marks on the under side. The room at the moment isn't heated but has been kept shut most of the time. The...

My insulation stands equal to or a bit proud of the battens I plan to fix plasterboard to. In the picture below the insulation is somewhat loose and I can push it so its equal to the batten. 1. Is plasterboard pliable enough for this not to be a big problem? 2. Is this a problem for wiring...

I'm installing a UPVC window but there are gaps up to 30mm since my block work wasn't even. 10mm __________ | | | 25mm | 25mm (30mm from outside just on this side) | | | | |__________| 0mm Is expanding foam suitable otherwise I was thinking of cutting a...

Ive poured a concrete slab floor awhile back and unfortunately it's not entirely level with it declining around 30 to 40mm over 5m. What would you recommend for levelling it? I have a half ton bag of ballast and half ton bag of builders sand left over I was hoping to use. I'm tempted to use...

Title says it all. It's time to fit a window in my single leaf concrete wall. The hole is out of square so I plan to correct this with 100mm treated timber on just 2 sides. I'm not sure how the sills go in and how do I waterproof the window? The exterior is cladco roofing sheet metal with...

Hi all I'm getting a bit confused about fascias. It's a flat cold roof (OSB, Firring, Joist, Wall plate and Mortar) which will have an EPDM rubber top. I have "Kerb Trims" (that sit on the top edges) being delivered and they come down around the face of the roof by 80mm~. 1. How do I figure...

I've got a single skin building, wall plate is on and it will have a cold roof. Where do I position the first joist and the last joist? E.g. How do I create an overhang for drips on the side but also have a place to stick the edge of the ceiling plasterboard? Front and rear overhang is...

I'm about to reach my outbuilding's max height but another course of block would make it too tall when I come to doing the flat roof. Possible options a) 2 courses of brick then roof or b) 1 course of aerated block, cut short via reciprocating saw (around 30 units?). They sit on medium...

The block wall I'm laying is now too tall and out of reach. I want to get the building to 2.5m. I was thinking trestles with a scaffold board across the span.

Building a 5x3m outbuilding to act as a gym. I'm switching from a cavity wall to a single skin pier design due to time / money. Is it still reasonable to ventilate between the block wall and the insulation board? Would I use air bricks and leave gaps in the battens for air to circulate through...

First time building anything with mortar. I put up a block wall and used a ratio of 4:1 sand:cement with a splash of plasticiser. The mortar had a smooth texture, kept it's form, stayed on the trowel and was easy to apply if I wet the blocks a bit. The following morning it seemed to set and the...

Is it reasonable to mix block density on the same wall for a 5x3m building? This would be the 7n 20kg blocks with the medium and light density blocks for an outer wall and aerated for an inner wall. Background: I ended up with eccentric foundations with the outer coarse running just a few cm...

I'm making a blockwork building at the back of the garden (12.5m2). I have a rectangular trench fill foundation (c20). It will hold a cavity wall of dense and light blocks. Unfortunately, I wasn't accurate and a part of my foundation narrows. I figured it would be simple to dig out this...

How do I lay trench block on uneven chalk ground? My plan would be to use a blinding layer of sand but I don't know if that's suitable and if it requires a wacker plate. Background: I'm building a 4.5 * 3.3m outbuilding. Ideally with a cavity wall of dense and light block. But can scale back...

Hello all :) Never built anything big before. I'm want to build a masonry 15m2 outbuilding as a gym. I want to use the building all year round and I can imagine a lot of body heat being generated. I plan to have an electric heater too for winter. I have two wall designs I would appreciate...

I'm building a 5x3m 2.5m high single skin concrete outbuilding. It will act as a gym. I'm looking for advise with the foundations. Based on Structure: Approved Document A the width of the footing is advised to a be a minimum width of 250mm and depth of the excavation 450mm based on my wall and...