ᐅ Insulating a cold roof with compressed fiberglass insulation, cost
Created on: 15 Feb 2019 17:39
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NordlysHello friends,
We have a bungalow with a slab measuring 13.5 by 10 meters (44 by 33 feet), and a hipped roof with a 30° pitch along the length and 45° on the short sides. So far, the roof is not insulated. The roof area is approximately 160 square meters (1,722 square feet), possibly a bit more. The ceiling between the floors is insulated. We use the attic not as living space but as a cellar substitute. It is accessible by a staircase, not a hatch, since the stairs are easier to use. A patio door separates the living area from the unheated attic well, providing good thermal separation. Unfortunately, this floor gets very cold in winter during frost — I’ve even had paint freeze — and very warm in summer. Now that we have some funds available, we have asked a carpenter to provide a quote for insulating the unheated attic floor (ceiling below the attic).
He is quoting us 8,500 gross for installing 200 mm (8 inches) of cavity insulation between the rafters, along with a vapor barrier and drywall lining, without plastering or painting.
Is this a fair price? Too expensive? Or even a good deal?
Karsten
Hello forum!
If anyone could share their opinion or professional advice on this, I would be grateful 🙂
"Is there any technical reason against installing the insulation flush on the inside and finishing it with the vapor barrier, so that the cavity remains on the ventilated outer side? Nonsense or a possible alternative solution?"
If anyone could share their opinion or professional advice on this, I would be grateful 🙂
"Is there any technical reason against installing the insulation flush on the inside and finishing it with the vapor barrier, so that the cavity remains on the ventilated outer side? Nonsense or a possible alternative solution?"
Tolentino schrieb:
Warning, this is just an opinion:
I thought that’s how it’s done. “It would probably be correct” if the insulation thickness matched the rafter depth 🙂
Since that is not the case for me at the moment, the question is about the technically “proper” solution despite the missing 6cm (2.4 inches) insulation layer.
In other words, whether the 6cm (2.4 inches) cavity on the outside would be acceptable or should be completely avoided.
Hmm, it seems no one really has experience with this or thinks it’s nonsense 🙂
Musketier schrieb:
Is buying an extra 6cm (2.4 inches) and inserting it behind an option?I have actually considered that too. If things turned out really badly, I would probably do it. Before purchasing the 180mm (7 inches) insulation, I heard various opinions from my circle (including here 😉) that using thinner insulation would not be a problem. After buying it, I am now hearing from several sources that it wasn’t such a good idea 🙂
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