Alternative Technology Assn Forums

1. 

   dale182
   Member

   Hi guys,

   I have an upcoming renovation planned on my house which I think was built in the 40's/50's. The foundations are large bluestone pitchers that has a bearing plate sitting on top (bearing plate is very crook with rot and I'm currently chatting with restumping mobs to have it replaced). The floor joists sit on this bearing plate and then the walls sit on the joists.
   Anyway.....Once this bearing plate is fixed I plan on pulling up approx. half the old timber floor (it's had a good life and is beyond salvageable) and replace with nice new solid timber floor (thinking Spotted Gum).
   So I thought that after I pulled up the floor it would be a good chance to pop in some insulation. I have been looking at Bradford's 'Optimo' insulation. These are batts that fit snuggly inside the floor joists. Is having an air gap essential in this situation???? Considering that my floor joists are 90mm...if I use the 70mm batts I could maintain a 20mm air gap between the tops of the batts and the underside of the floor. The other thickness batts available are 90mm which would rest hard up against the floor.
   Could anyone recommend another product other than a batt for this?
   Any advice or recommendations greatly appreciated.
   Dale

   Posted Monday 8 Jul 2013 @ 11:36:58 pm from IP #
2. 

   Morbo
   Member

   seems there is a humidity issue, or is water coming down the walls? Get that sorted first, insulation may rap the humidity.
   We have a 1950 weatherbord with bullnose boards and they buld it in a funny way so that the water goes around the bullnose and straight into the bearers. Put flashing underneath the last board which guides the water away, over the skirtings.

   If the former nobber would not have cut the floorboards at random and then put carpet on top, ours would be still good. Even in the dodgy bathroom.

   Posted Wednesday 10 Jul 2013 @ 11:36:22 am from IP #
3. 

   dale182
   Member

   Morbo,

   My place is similar...there happens to be a 30-40mm lip of bluestone at the base of my walls....so the water runs down the weatherboards until it lands onto this bluestone edge and then its within a weatherboard thickness of this bearing plate....eventually leading to rotten bearing plate....no flashing installed11!..I'll be able to flash it correctly when I pull all the weatherboards off...I'm pulling them off so I can get in and insulate the walls...replace some crook studs and then put up new Sycon linea weatherboards

   Posted Thursday 11 Jul 2013 @ 9:42:30 pm from IP #
4. 

   Morbo
   Member

   lucky its on stumps, was not too bad. Just need decent airflow underneath the house.

   Posted Friday 12 Jul 2013 @ 10:50:08 am from IP #
5. 

   Morbo
   Member

   I did some data logging over the years, it does not reach 100%, so no condensation.
   Candidates:
   expol
   sisalation
   sisalation plus 70mm batts

   sisalation by itself is sufficient already plus I guess it reduces drafts. In old floorboards there are decent gaps

   Posted Friday 1 Jun 2018 @ 11:39:27 am from IP #

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