Roof Battens Size

PoGee

What should they be? One's saying counter battens will be 10 mm by 38 mm and the other roofer 19mm X 38mm. Re tile battens - first one saying they will be 25 X 50mm and the other roofer 25 X 38mm. Both doing dry hip and ridge system. 
How long should the warranty be? Is 10 years the norm?
Is 9mm OSB board thick enough?
Should they be fitting insulation in also, other than the breathable membrane and OSB board?

andy444

25x50mm and 38x50mm would be acceptable roof batten sizes for me.

It slightly depends on the pitch of the roof but I would be tempted to go for a slightly thicker OSB panel size.

You'll probably get more answers if you post in the DIY section of this forum.

stuart45

Batten size depends on whether the rafters are 450mm or 600mm, as well as type of tile/slate. 9mm is standard for OSB. Counter battens are fixed first to lift the tile battens enough for the.membrane to drop down enough for any moisture to run past the battens.

FreeBear

PoGee said: Both doing dry hip and ridge system.

Having had a number of roofers round over the last few months, all bar one were telling me that they are busy replacing dry ridge systems that were done 10-15 years ago. Plastic turns brittle after a few years being exposed to the elements, so it comes as no surprise to me that the clips are failing. Working with traditional mortar takes a bit more time and skill, but done right, it will last a lifetime.

All of my ridge & hip tiles were still firmly bonded to the original late 1920s mortar. I would expect the new tiles to last just as long being bedded in on mortar.

stuart45

PoGee

Should they be fitting insulation in also, other than the breathable membrane and OSB board?

The insulation can go either at ceiling level or rafter. It can go over the rafters or inbetween them.