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Lots of thin layers (thats what my mum told me) wear a vest under your shirt

Every little helps

a little bit

Almost everything is an insulator alistair, i know felt is not sold as insulation (unless you specify insulating felt then it is) . Curtains are not sold as insulation but they definitely keep my living room warmer! You cant eliminate heat loss you can only slow it, so.... Lets say a house has...

Yep brigadier i know only too well local authorities failings, but they makes the rules House builders and the authorities that allow, control house building, we are all under pressure to increase energy efficiency (which is a good thing) The most popular roofing felt brands sell a range of...

notaplumber, great news you got it sorted✔ And now its felted it will be much less draughty and cleaner in your loft, and of course......warmer

The felt should not have open laps

If the loft is warmer with felt ........, then it must be insulating! jeez.!

Tyvek is a brand not a manufacturer

To be honest i have only worked with Sussex and Surrey, maybe they are , special in devon

Take a look at thr tyvek website freddy

Local authorities insist that any building for use as a dwelling must have felt because it increases the energy efficiency of the building. Felt was first used under slates 'sarking' way before concrete tiles

To say felt has no insulation value is wrong. EVERYTHING has an 'R' value! I know a loft with felt will be warmer than a loft without!

Yes that's ok David, cut them wherever needed

Just the draught excluding property of the felt

True you don't need felt to have a sound water tight roof but the difference between the temperature in a loft on a cold windy day that doesn't have felt and one that does is huge!

Unlikely to be condensation if its that bad No condensation before? Suddenly started after a storm? Surely its a leak

I cant believe that kept rain out for five years!

There is a formula a carpenter once told me (type of tile/slate + pitch =) but im not a carpenter

Do one and half inch, the tiler will add a lathe if necessary