ᐅ Create an insulated utility room for the gas boiler in the attic.

I can’t tell you the exact requirements regarding the vapor barrier and ventilation, but this is not an unusual approach and is therefore probably not an issue. Friends of ours were offered this directly by the main contractor without any additional cost (according to the scope of work).

In the next few days, I will measure how much insulation and vapor barrier I would need to fully insulate the roof. Could there be any issues if the ceiling below has already been insulated?

Basically, no at first. However, I still recommend keeping an eye on the humidity and ensuring there is a way to ventilate.

To create a frost-free and not overly hot storage room in summer, we recently insulated the attic space above the ceiling. A carpenter and I worked together as helper and tradesperson. The room has a Velux window for ventilation. We used about 100 sqm (1,076 sq ft) of 160mm (6.3 inches) compressed mineral wool, which was sufficient for our needs – thicker insulation wasn’t necessary. In addition, we installed 100 sqm (1,076 sq ft) of breathable membrane, 40 meters (131 feet) of batten, 240 meters (787 feet) of cladding boards, 5 cartridges of adhesive for the membrane, 4 rolls of foil tape such as SicaCrall, and three boxes of Spax screws.

We chose the breathable membrane instead of a standard vapor barrier as a precaution, because the space is sealed in winter but the insulation can dry out in summer if any moisture gets in. The carpenter was very meticulous in ensuring that the membrane was sealed tightly everywhere, which he considered very important. The two of us took about 2.5 working days in total, or around 20 hours each. The outcome is very satisfying. The space feels completely dry, comfortably tempered, and not stuffy. I occasionally ventilate through the Velux window. We will see how it performs during winter.

Costs: $1,500 for materials, 20 hours labor.

Karsten

Golfi90 schrieb:

He said he will build an insulated "box" around the equipment.
Is that possible? If so, that could be an idea for us too!

I think it’s nice that you’re asking about this for your neighbor – but the follow-up question for yourself puzzles me: I thought you were already at the stage of eagerly awaiting your windows? In that case, the installation location of the heating boiler is usually already sorted out, in my opinion.

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Golfi, I encourage you to insulate the entire roof right away, not just the enclosure around the heating system. Look at the pictures to see how much storage space you gain. It’s like having a cellar, but much cheaper. K.