View images that speak more than long speeches here is photos of a site on which I last advice and guide to make a renovation of the best way (in my opinion the best way under renovation)
It is therefore here a renovation, it's a roof that does not have firewall rain so you have to leave a layer of air with the least 3 cm below battens and batten so that the moisture can escape naturally through roof vents, so let the wood dry and therefore not cause any disappointment wood rotting ...
The principle here, and elsewhere, is to map the high-density wood panel, which are wood fiber panels densified 250 Kg / m3.
Here they are Hydro panels that can serve as cons-ventement in OSB (wood frame), and instead the film _pluie visor during a single roof from the outside (say sharking).
The panels are therefore plated directly on the underside of the rafters (here it's true * 80 60 mm rafters) so there is an area of 80 mm blade on the underside of roof.
The periphery of the panels for sealing a seal of mastic is laid, and a seal of mastic in the groove as tongue (with the top tongue as in a cladding of course, so that the water would come hypotéthique to fall if a leak was coming to appear would be guided to the roof foot and then got on the outside).
In the situation shown here, the wall, the junction purlin and rafters, there had braces, they have not been removed but merely pierced by 3.2 cm of holes for ventilation.
In this photo are can see the dense wood panels (in light brown background), and these cleats * 50 50 are screwed to enable the grip box boards (here the board in Douglas 25 cm order have the final 26 2.2 cm wadding + cm dense wood insulation boards, so 28 0.04 cm lambda insulation) for injection wadding (batting should be instilled in maximum boxes 80 cm wide to avoid not have too much compaction, maximum height of the boxes is 6 6 m m but is limit ...).
The rafters * 50 50 are so fixed in the original rafters * 80 60 of the frame in and grabs hence the dense wood panels sandwich.
A view more ready, have the seal chews see white on breakdowns. (There are now mastics VOC type SIGA Primur is an example of brand) .We also see the chalk line that will serve the lines laid metal which receive furs)
Fur posed with the early break of the membrane.
The membrane had a transmittance of steam corresponding to the transmission fiber panels of wood to conform to the migration of the air loaded with water, in order to tell a system breathable (or breathable;)).
The principle is to have an air permeability of growing from the inside to the outside so as not to slow down the migration of air loaded with water.
The membrane is caught by cons cleats douglas 25 50 * mm, in theory it is recommended against the cross battens with a first layer of battens or strip of OSB 9mm 45 mm wide, all 50 cm and then re -contrelater in the sense furs, personally I know it goes with the injection provided for 50 kg / batting m3 so I take particular care to stretch the membrane so that it does not deform, which would prevent them poses dubbing (here is the fermacell, but it also applies to the plasterboard).
Advantage of the counter battens is that it is a technical sheath for the passage of electrical cables without piercing the membrane.
here a detail with metal hanger, and a roof window.
The roof window is posed unretouched of the frame so the insulation on the outskirts here will be small evil fortunately.
see here have a wool layer of wood on the edge of the roof window and the corner of the window pieces of heavy wood panels for sealing against the rafters * 80 60.
It lacks a bit of wood wool insulation cut into triangle so as not to hinder the break dubbing.
The finished face, did not see because of the light vapor barrier paused in the doorway of the roof window, brake (yellow) is (for purchase too fast because the owner of another kind and has a much less important than the transmission therefore more waterproof membrane, but most do not support the injection of wadding from its low resistance to tearing, but agree vapor transmission side, instead of throwing or sell so the remains, they are used in some places).
Also see the right foot with a yellow vapor barrier too).
Wall side.
here is a window frame, too big windows over the opening, suddenly little insulation, better to lose a little light insulation, but this is like that so you have to make do.
Personally I would have asked recessed installation and not apply, as here, in order to provide open with an angle the future dubbing and therefore both have a sufficient insulation dose and higher light in the room.
here the expanding foam will be injected to the isolated edges of the windows at best .and against the wall and top and bottom type PIR foam panels (with a very low lambda allowing to have maximum isolation for a minimum thick).
The same wall with the membrane, as fiberfill insufflation here on 120 mm thick.
here details wood frame for walls with .Ont box and spacers also see Excelsior falls for clogged the last hole so that the wadding not escape there.
Following wall (sorry for cons days not practical to see well, but I do not have flash on my phone;)).
The horizontal brace are used to maintain the vertical pillars when insufflation.
The amount are 25 * 50mm but can also be done by 50 50 * mm, and in the scope not have added or intermediate apuis to obtain hard and not flexible wall;) ..
in metal frame it is the same thing attention to the worn if you do not want to have a wall or partition that deforms when you rely on it (generally in single amount of 48 mm the maximum load is 2.0m plus long have double the amount, limit 2.5 m, or have put supports that reres the amounts to the wall, with scrap it's simple have takes metal sole and made angles not simple folding that is crimped with the crimping pliers special metal profile) ..
Instead of cellulose wadding and for laying the easiest shot, may have put some wood wool, seen here that the site is self renovation break time is not a concern then, wadding is therefore cheaper ...
You will find at Kiloutou eg carding machines for rent, care the carder must be infused cotton wool and not just blow, but it is marked above (or the user instructions).
I would complete this subject when insufflation to explain how (it's simple) have blown.
In hope this helps some of you, and do not hesitate to ask questions if necessary.
here is the kind of testimony we would like to (re) see more often about forums... (I know times of crisis are more about individualism when it should be quite the opposite ...)
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