Our house is too tightly sealed, so I was thinking of cutting holes in the walls for new vents, but I'm a bit concerned about sealing them correctly.
The hole saw is 102mm and the duct is 100mm, so there will be a small gap in the wall. Is it enough to seal with silicone around the gap in the wall, or is the idea to use expanding foam or something similar to protect against drafts, moisture, etc.?
Can anyone offer advice so I do it right from the start?
The hole saw is 102mm and the duct is 100mm, so there will be a small gap in the wall. Is it enough to seal with silicone around the gap in the wall, or is the idea to use expanding foam or something similar to protect against drafts, moisture, etc.?
Can anyone offer advice so I do it right from the start?
I want an answer to the same question roughly.
I have bought fresh air intakes that I will install above four windows.
What is the best way to get the penetration through the vapor barrier sealed against the duct?
The plan I have right now is to cut a hole in the plastic that is slightly too small and then seal between the plastic and the drywall by taping strips on the outside of the plastic and pulling them onto the inside of the drywall. Then I plan to seal with latex or silicone between the duct and tape/plastic when I have installed the duct.
Is this an okay way or are there better methods?
How have you others done it?
The house is a villa Nybro from Smålandsvillan and the work is to be done on the upper floor.
I have bought fresh air intakes that I will install above four windows.
What is the best way to get the penetration through the vapor barrier sealed against the duct?
The plan I have right now is to cut a hole in the plastic that is slightly too small and then seal between the plastic and the drywall by taping strips on the outside of the plastic and pulling them onto the inside of the drywall. Then I plan to seal with latex or silicone between the duct and tape/plastic when I have installed the duct.
Is this an okay way or are there better methods?
How have you others done it?
The house is a villa Nybro from Smålandsvillan and the work is to be done on the upper floor.
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I have cut a hole through the plastic around 10-15mm smaller than the fitting and pressed it through the plastic. It then sits tight against the outside of the fitting. The same method for downlight pots.
The likelihood of warm air being pressed into the insulation at a small gap in the plastic layer at the valve and an open supply air vent is minimal, right? And the usual thing with overly tight houses with mechanical exhaust is typically a negative pressure. So not much should be able to happen if you don't get it hermetically sealed.
If it were that picky, no house manufacturer would cut holes for electrical boxes. While it is a rule with most. If you create a slight negative pressure, it's not a problem. There can be problems (CAN) in houses with natural ventilation.
You are wrong there. My house from 1976 has both plastic and natural ventilation. However, we converted to essentially mechanical ventilation. Due to pressure-impregnated sills, under-pressure vents were installed under raised floors (Anticimex).AndersS said:
I have exactly the same thought. But in my case, it's about a new build, a holiday home. Therefore, I have been considering whether to install the vents already now while the house is uninsulated and not plastic-covered to make it easier. What do you think about that?
Cool, looking for an answer to the exact same question. New build, holiday home that will soon be diffusion-tight. When should you install fresh air vents?
In our extension, we insulated and sealed the walls before going at it with the hole saw. It felt easier that way instead of having to cut and fuss around the intakes. Then we installed these around all the intakes.
https://www.soliduct.se/rorkrage-angsparr-dia-80-dia-200/p-2509.htm
https://www.soliduct.se/rorkrage-angsparr-dia-80-dia-200/p-2509.htm