Cavity Wall Insulation
Posted 05 December 2013 - 06:11 PM
when the 600mm deep foundation is filled with concrete do you start the insulation after the two courses of bricks below ground level up to the DPC level or do you leave the space of two courses empty below ground up to the DPC level and start the insulation after DPC level! OR is the two courses below ground is the right level to srart the cavity wall....................... does the same rule apply whether it is new 1 story building or an extension to an existing building.
Posted 05 December 2013 - 07:06 PM
Assuming a 'regular' build you start the insulation at dpc height.
Posted 05 December 2013 - 07:41 PM
Might not be so critical on an extension
Posted 05 December 2013 - 07:42 PM
Edited by temp, 05 December 2013 - 07:42 PM.
Posted 05 December 2013 - 09:09 PM
Edited by joiner, 05 December 2013 - 09:13 PM.
Posted 05 December 2013 - 10:11 PM
All of the examples I've seen on site have been with cavity ties deliberately fitted at dpc level to support the cavity bat.
I'd be concerned about a wet bridge if going below this, but maybe a solution to allow cavity collected water / damp to drain naturally is already a part of BR. My knee-jerk reaction would be DPM level and above. :-?
Posted 06 December 2013 - 06:43 AM
The BCO may require a cavity below the DPC. One reason is to prevent any snots falling down the cavity from bridging above the DPC.
Posted 06 December 2013 - 10:47 AM
You will therefore appreciate that any snots falling below the DPC will only affect the area not protected by the DPC anyway. Whereas as any snots sitting above the DPC...!
(DPC being the Damp Proof Course.)
Edited by joiner, 06 December 2013 - 10:48 AM.
Posted 07 December 2013 - 08:29 AM
One interesting consequence is that the lower part of this north wall (the bit below floor level) no longer goes green with algae as it used to. I can only assume that the colder average temperature of the outer skin is slowing or preventing the stuff from growing.
Edited by jsharris, 07 December 2013 - 08:30 AM.
Posted 07 December 2013 - 07:11 PM