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Plumbing

Insulating a loft with a combi-boiler installed

Anonymous user 23/02/2024 - 3.34 PM

Hi all, We're currently insulating the loft (celotex) and boarding the floor, ready to make it habitable. However, our combi-boiler is up there too. It vents through the roof membrane via a tile stack/pipe. My question, how do we insulate this area without compromising the boiler? I thought the safest route would be to create a floor to ceiling 'cupboard' for the boiler which is insulated internally, not touching the boiler itself. The door to that cupboard would have a rubber seal. Or do we simply insulate around the pipe out of the roof, so the boiler is part of the room? Thank you!

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4 Answers

Anonymous user

Hello, The easiest and cheapest way would be to insulate around the flue itself however, it would look nicer hidden in a cupboard. Kind regards, Chris
Answered6 August 2020
2

LLYN CAMBRIAN ELECTRICAL PLUMBING

Rating: 4.8 out of 5
Wrexham
Cannot see a reason to insulate the flue at all obviously the flue is warm in use and nothing to be damaged with low temperatures
Answered7 August 2020
0

Trevor Messenger Plumbing and Heating

Rating: 4.9 out of 5
Castle Cary
The boiler can go in a cupboard if you wanted it too, it is fan flued so needs no extra air supply, but you may need to put vents top and bottom to stop it getting too warm. I would just insulate to the clearances given in boiler instruction book.
Answered28 August 2020
0

Martin House Plumbing Services

Rating: 4.8 out of 5
Lymington
Do not box in the flue as the joints may need to be inspected for certification purposes. Building it into a cupboard would be fine, providing you observe the required space to be left at the sides & front for maintenance & servicing. You will find these measurements in the boiler product data pamphlet. Please also be aware that if you are creating a living space, that ceiling joists are not a suitable substrate for a floor & you should be installing suitable timbers. It used to be 7" but may well be 9" minimum depth now, you would need to check the regulations. Hope this helps.
Answered29 August 2020
0