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Everything posted by saveasteading
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Grease filter kitchen extract
saveasteading replied to Oz07's topic in Mechanical Ventilation with Heat Recovery (MVHR)
Doesn't that reduce the suction significantly? Especially once it gets dirty. I was looking recently at the effect of an extended duct and bends, and it was much more than I had expected. -
Insulated Concrete Slab Garden Office - Questions
saveasteading replied to Ticky's topic in Garages & Workshops
I dont like the exposed polystyrene on the outer face. It will get damaged, and isnt easy to fix or to fix a face onto. How about a compromise and use a thin but durable insulating board like Wedi Board? I would just use 12.5mm to take the edge off the cold bridge. but thicker is available. Sole plate to edge of concrete, then wedi over the concrete and the sole plate. -
Unnecessary with a good and thorough brickie. But it does ensure that excess is not poking into the cavity, and that it is compressed. I think I might even pay a little extra for that. Flush should suffice though. How to check? Brickwork before inner block, makes it visible. Alternatively stick a hand down the cavity and feel between the bricks. Some 'brickies' have been doing it for days (they were labourers last week) , and aren't keen on questions. Diplomacy. Others are stunningly skilled. As with many trades the best ones don't seem to be working as hard but somehow do more in the time. Again diplomacy...they would do it properly anyway.
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What everybody else says.(some of it anyway) Then do your own test ( as ProDave and others). Tape over all fan and other ducts. Close or tape over window vents. Dont assume any builder understands airtightness. Then tell the testeron site that you need 0.8 ( or whatever) and are confident of achieving it. Difficult gaps to complete are at the eaves ( and there is a lot of it) and openings. Examine the detail, discuss with the builder. Supervise.
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Remarkably similar quotes. Maybe thank them and ask how many site hours and office hours they anticipate. And if there is there anything you can do for them to reduce the cost. When you eventually have them on site, it is a good idea to show great interest, ask what they are looking for and shadow them all day. Ie killing off additional research. I did that successfully....no roman road. I explained to the guy that ironstone is natural and it wasn't an old road.
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I've been to lots of planning committees. They have all been run very correctly, including severe guidance to any councillors ( from chair or the chief planner) who go off piste. Most members turn up without any preparation and take the lead from any councillor who speaks for or against. In truth they don't care much about 1 crossover outside their constutuency. I do feel that the councillors can be influenced by personal statements, and so they should as our representatives. Therefore it is important for either side to make use of the 3 minutes to speak.
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Retaining walls required before garage foundation
saveasteading replied to wertert's topic in General Structural Issues
That looks really dry and hard. Perhaps try a breaker with a spade bit? -
Insulated Concrete Slab Garden Office - Questions
saveasteading replied to Ticky's topic in Garages & Workshops
This isnt a raft. A raft is a very heavily constructed slab, linked to a ring beam, that all supports the structure. In your case the structure should sit on tge thickened edge which sits on the hardcore base. The slab supports you and furniture, and pir can do that. If it was a house, then you would take the footings deeper. I see this as a garden shed with insulation and draught proofing. People have a point though....will a skinny footing support the structure and stop it blowing away? So yes, dig a trench around and make the footing deeper and heavier. People on here aren't wrong becuase we are suggesting different solutions. We might all do it different ways depenfing on cost, performance and risk. It is make your mind up time soon. -
Insulated Concrete Slab Garden Office - Questions
saveasteading replied to Ticky's topic in Garages & Workshops
Pir stops short of the edge by 150. Concrete at perimeter sits on the hardcore. Hard-core is min 150 outside the slab. -
Insulated Concrete Slab Garden Office - Questions
saveasteading replied to Ticky's topic in Garages & Workshops
How about this? 100 hardcore with sand blinding. Dpm 25mm pir board. Dpm 100 concrete. wall plate on edge of concrete. Cladding oversails. Live with the heat loss the slab perimeter. Air to air heater/ chiller. Roof osb then battens and metal. The gap will allow a lot of the sun heat to dissipate. This will save you a lot of time and construction cost, and enough insulation to avoid the worst extremes. Logic? If heating the air only in daytime, by the time the slab has warmed up, you are turning it off again. -
He is right. The ground has been disturbed. Only gives an indication of the ground conditions. I wouldn't be getting lab tests done. The ground will be typical all around the area and an SE or bco can tell by inspection. However, when your tree hole is dug, do poke at it, and take pictures for us here. And no reason why you can't take a sample. Dig a neat lump out and put it in a sealed container.
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Personally, I would get some type 1 or ballast even. Whack it down with a tamper. Then it will support the footings and wall, will not wash out, won't act as a soakaway, and you can dig neatly through it without collapse. If you use hardcore it might be fine but I can't say without seeing it. You are looking for something solid without voids. You could poss mix your stones up with some grit or sharp sand.
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Do not backfill with the chippings. Not suitable next to the building. Put them in bags then either use as mulch or to brown bin, or to the garden waste at the tip. Backfill with stone, tamped hard.
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ICF How much more expensive ?
saveasteading replied to Dave Jones's topic in Insulated Concrete Formwork (ICF)
I am rather surprised that the kit has not been made to do this. So I would seriously suggest to use the old 2 x 2 method of tamping. Just move a timber up and down in the concrete and it will mix and settle it, and remove air. It also merges the previous pour wit the new one, if soon enough and so loses a weak layer. Looking at that picture, though, there are skinny vibrating pokers that should fit in there. Ask the plant hire company to get one in. Wind speed at Wick is averaging 20km/h this week, up to 38km/h (10m/s.). That is windy. I am thinking Happy Valley's support inside and the scaffolding outside, wedged against the wall....and lots of stages. Somebody earlier mentioned the wind during construction. The building will create increased wind speed and forces during construction, so all edges are vulnerable until all the openings are closed. Adding the roof before infilling windows also increases the forces. It would be the same for timber of course, and it wouldn't be as heavy as concrete filled walls. -
ICF How much more expensive ?
saveasteading replied to Dave Jones's topic in Insulated Concrete Formwork (ICF)
A downside of stages is in getting concrete delivered in small , and expensive , quantities. And if you have outside labour, then that too. Unless of course you mix your own on site, when the small stages make it less daunting. I think on our project they were mixing 1m3 an hour with a domestic mixer. -
ICF How much more expensive ?
saveasteading replied to Dave Jones's topic in Insulated Concrete Formwork (ICF)
Are you allowed to build and fill in stages? -
ICF How much more expensive ?
saveasteading replied to Dave Jones's topic in Insulated Concrete Formwork (ICF)
That is because you don't have the freedom that Britain has to buy from wherever. Oops. Politics Seriously gb doesn't produce cement any more so it is imported. Stone and sand aplenty though, so the rest of the cost must be higher wages, and profits, and prices from different sources remarkably similar. Best price for lots of blocks is usually about the same as readymix. So may be about £1.50. Perhaps others are more up to date on current prices. -
ICF How much more expensive ?
saveasteading replied to Dave Jones's topic in Insulated Concrete Formwork (ICF)
Standard blocks are about 70c here inc vat and aerated about €2-3. What's the price difference there? Today wickes are saying one dense block is £2.70, inc vat, aerated £2.60 and medium dense £3.25. Each. Obv that comes down a lot for quantity.
