In message , The Natural Philosopher
writes
On 22/06/2019 20:43, Tim Lamb wrote:
In message , "dennis@home"
writes
On 22/06/2019 09:31, Tim Lamb wrote:
In message , Brian Reay writes
Jim GM4DHJ ... wrote:
why do the English not use sarking ? ....




They do.

Some older houses may not have it but more modern ones certainly
do. All
the houses we own/have owned have sarking felt.
*Huh! Now try and get your builder to use it!
They have latched on to porous membrane in the firm belief that
roof ventilation is no longer necessary. Also try and get them to
use the grade required for your area wind prediction and double
sided tape for laps:-(


Building regs require roof vents so they will fit them.
None fitted here. Building control were stressy about maintaining a
50mm gap between the insulation and the membrane but ignored the lack
of soffit vents.

Not even ridge vents?

No. Mind, these are Marley rolled concrete tiles so hardly an airtight
fit. They did fit plastic eyelashes to discourage birds and insects at
the eaves.

--
Tim Lamb