Insulating cellar ceiling

[CHRIS]

I have a cellar under my living room and at the moment all it is original split logs as joists (150-250mm dia) with elm floor boards nailed at 300mm centres, having just improved ventilation to the cellar to help with damp (fixed problem) my floor is getting very cold even at this time of year.

I am considering insulating with sheeps wool between the joists as per Thermfleece website but as I like to work in the cellar doing carpentry I have to somehow board out the ceiling to stop the fleece getting covered in sawdust, but as the joist sizes are so irregular putting up some type of board is not really not possible as plaster board etc will not bend that much - even split lath may be a problem, what options should I look at? I have considered Triso Super 10 (building control surveyor quite liked this idea) as it will trap less dust than the fleece but will have to be careful with ventilation etc. I am not to fussed if the joists are exposed or not but I would like a warmer living room.

thanks

 

[biffvernon]

How about just stapling thick paper onto the joists below the Thermafleece? The sort of breather paper available at builders' merchants would do.

Lath and plaster is the ideal permanent solution and can be bent round any shape you like but the work might not be justified if you just use the cellar for occasional work.

I would be very wary of using Tri-iso 10. It is not breathable so is not going to help with damp problems in the cellar. The advertised insulating properties are very controversial and it does not at present carry the certification which your Building Control Officer may believe it does. You might like to look at, and point out to the BCO, the debate that rumbles on here:
http://www.greenbuildingforum.co.uk/forum/index2.php?DATEIN=tpc_wlpssdlpg_1142805843&showpage=49

 

[Gervase]

I'd go along with biff's suggestion, but suggest hessian rather than paper as it's tougher, less likely to tear and more breathable and resistant to moisture. It staples easily enough to the timbers and holds the insulation nicely.
You can get socking great rolls of the stuff from places like Ty Mawr.

 

[CHRIS]

Thanks for the ideas, I hate to be a bit of a jobsworth but how would the firestoping be looked at for these ideas - I can just see any Surveyor having Kittens if he saw hessian but some breather paper may be ok - I also have electric cables fixed along the joists so I will be carefull