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    Is this mold on osb cold roof?

    This is something I built from scratch in the back garden so there was nothing there before. Is your comment about the celotex in reference to my picture? I planned to place the celotex in so that the ventilated gap is the top of the celotex and the underside of the osb. I will staple a...
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    Is this mold on osb cold roof?

    Thank you kindly for your detailed response. Mold is fine as long as it doesn't rot the roof away. It's hard to tell if the airflow is adequate. The other end of the building is against a fence. I also think I installed the soffits the wrong way round ? I have some leftover primer (mapei...
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    Is this mold on osb cold roof?

    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...
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    Insulation standing proud of battens

    Yeah I was planning to spray foam the gaps and then cover everything exposed with silver foil tape. As for the electrics my plan was to cut channels in the insulation for wires and then foil tape that as well. The wall undulates a bit hence the discrepancy. And the wood wasn't exactly cut as...
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    Insulation standing proud of battens

    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...
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    Installing window gap

    I forgot to add. Do I need to use any damp proof membrane / course material if I'm installing it into a single skin block wall?
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    Installing window gap

    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...
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    Levelling interior concrete

    I've done a bit more work today without concrete and I'm almost done. I'll finish the rest with sand cement and then buy some self levelling material.
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    Levelling interior concrete

    I've reached the point of my floor which the depth to make up is at least 50mm. I have half a ton bag of ballast left over. Any problem if I coat the first 25mm with mixed up concrete and then finish the top with the sand cement screed (immediately after the other)? Will save me £££, a trip to...
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    Levelling interior concrete

    I haven't decided yet. Probably something like laminate wood flooring. Yes I will likely load my car up with sharp sand.
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    Levelling interior concrete

    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...
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    How do I fit window in single leaf block wall?

    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...
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    Fascia board help (Heights and cap over)

    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...
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    First and last joist position (flat roof)

    You mean something like this?
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    First and last joist position (flat roof)

    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...
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    Reaching max height: bricks or cut aerated block?

    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...
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    Laying blocks out of reach ?

    I'm asking methods for working at height. As in how do I lay blocks if I can't reach high enough Cheers
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    Laying blocks out of reach ?

    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.
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    Insulating single skin

    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...
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