I have a first floor bedroom the front wall of which is linked to a porch roof. There is a void under the bedroom floor running out into the porch roof. Consequently the room is difficult to heat as cold air from the porch roof area comes thru the void under the bedroom floor. What should I use to insulate the area under the floor boards? Should I block the void?
Insulation UNDER a bedroom floor
- Thread starter adrianbowring
- Start date
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Mineral/Rock wool is as good as anything.
The one concern would be "electrical cables and thermal insulation"
By introducing thermal insulation to an area where electrical cables are, you will be altering the method of which the cables where installed (known as the "reference method")
This will affect the current carry capacity (CCC) of the cables.
A derating correction factor of the cables maximum CCC, may need to be applied.
In most cases, the lighting circuits on 5A or 6A devices are unaffected, but power circuit (sockets, heaters, cookers, showers etc..) are, as these cables are often more closely rated to the current they demand.
They can quite quickly be reduced to 50% of the current rating of the cable.
Helpful Link
http://www.tlc-direct.co.uk/Book/4.3.6.htm
The one concern would be "electrical cables and thermal insulation"
By introducing thermal insulation to an area where electrical cables are, you will be altering the method of which the cables where installed (known as the "reference method")
This will affect the current carry capacity (CCC) of the cables.
A derating correction factor of the cables maximum CCC, may need to be applied.
In most cases, the lighting circuits on 5A or 6A devices are unaffected, but power circuit (sockets, heaters, cookers, showers etc..) are, as these cables are often more closely rated to the current they demand.
They can quite quickly be reduced to 50% of the current rating of the cable.
Helpful Link
http://www.tlc-direct.co.uk/Book/4.3.6.htm
cables are OK as long as the insulation is over, or preferably under, them, but they are not buried or encased in it. If there is free air on at least one side, the heat can escape.
If you have <vom> downlighters, you can get a smoke hood that will keep the wool off them (also dust) or can easily make little boxes with plasterboard, which will also reduce noise a bit.
You can fill the void completely where there are no cables, this will block draughts as well as adding insulation. You need a ventilated 50mm air gap under any tiles or other roofing as a precaution against damp.
I would only use mineral wool treated with Ecose which binds the fibres to prevent dust and loose fibres escaping. It is brown not yellow. It is made by Knauf but sold under own-brand names as well, but the packaging will show the word "Ecose".
If you have <vom> downlighters, you can get a smoke hood that will keep the wool off them (also dust) or can easily make little boxes with plasterboard, which will also reduce noise a bit.
You can fill the void completely where there are no cables, this will block draughts as well as adding insulation. You need a ventilated 50mm air gap under any tiles or other roofing as a precaution against damp.
I would only use mineral wool treated with Ecose which binds the fibres to prevent dust and loose fibres escaping. It is brown not yellow. It is made by Knauf but sold under own-brand names as well, but the packaging will show the word "Ecose".
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