Should insulation be used above the bathroom ceiling in the loft rafters or not?

Question

Should insulation be used above the bathroom ceiling in the loft rafters or not?

Answer 1

You say you have a Loft Ceiling, is this a open Rafter ceiling which you can see the backside of the roof and the rafters? If that is the style you would have to install roof chutes to the roofing boards you want air movement on the under side of the roof, from the ridge to the sofits otherwise your shingles will curl. Then you can add R19 if the rafters are 2x8 then after you have all that done you'll need to hang sheetrock over the whole ceiling closing everything in. as for cutting insulation all you need is a utility knife, just keep the blade sharp. good luck

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Answer 2

Yes you can do this. I have in my home. Are you worried about mold is that it? Don't worry you will see it on your sheet rocked ceiling before it has time to get to the insulation! Good luck on your project!

Answer 3

Yes!  I think it's "Absolutely necessary" for protection from heat or cold.  Also it is a great noise suppression material. Save money and be greener by adding as much as you can afford.

Why not the bathroom? If there is something wrong and it is wet up there, because it may be from humidity infiltration.  So if is not a leak from above the roof above the bathroom, it may be because there is no barrier to stop the humidity from entering the loft area that may come from the bath area and fan!

If is not wet up there and all is well, insulation is the most green thing you can do. It's good for resale value to have the whole rafter area insulated!  It's good way to save money on air conditioning, heating and lower noise levels.

Tips:

Always wear a mask and gloves and disposable clothes when installing fiberglass.

Never put insulation onto wet areas.

You may be able to buy insulation encased in plastic wrap. and or with a vapor-barrier.

Make sure vapor-barrier is up as per mfg. suggestion.

If tabs are on the insulation, staple the wings to the rafters.

Don't push it down hard or compress it.

Use a small saw or insulation knife to cut it.

Fit it firmly and tight to keep out any leakage into the rafter area.

If you have the money, criss-cross the insulation; one piece following the parallel rafters and then laying one piece going perpendicular; thus covering the wood and sealing any infiltration or missed areas.

If it is poured insulation; cover all of the rafters and then some.