What type of boarding above rafters

[Cpd]

20 minutes ago, ProDave said:

All I can say is all houses I see being built up here have sarking on the roof.

Same here on the west coast, standered practice. 

[makie]

1 minute ago, Cpd said:

Same here on the west coast, standered practice. 

 

Major house builders don't do it purely because it is cheaper and not required.

[Ed Davies]

It's not a matter of which wind zone the house is in, is it?

[Simplysimon]

all houses here have osb on top of the trusses. adds a considerable amount of racking strength to the roof, never seen one locally without osb or sarking if being slated.

[Thedreamer]

A lot of houses being built here on Skye use roof cassettes.

 

https://www.ruralhouse.co.uk/process/

 

I wonder how strong these are compared to the traditional rafters/sarking combination?

 

 

[ProDave]

5 minutes ago, Thedreamer said:

A lot of houses being built here on Skye use roof cassettes.

 

https://www.ruralhouse.co.uk/process/

 

I wonder how strong these are compared to the traditional rafters/sarking combination?

 

 

Isn't that in effect a cut roof pre fabricated and lifted in in sections?

[Thedreamer]

1 hour ago, ProDave said:

Isn't that in effect a cut roof pre fabricated and lifted in in sections?

 

Did you see the video? Are those bits that get lifted in, like SIPS panels but in a roof?

 

 

[ProDave]

9 hours ago, Thedreamer said:

 

Did you see the video? Are those bits that get lifted in, like SIPS panels but in a roof?

 

 

Yes I guess they must be some form of SIP panel. The interesting thing is that it is not a continuous panel the full length of the roof, an off thin panel was added at the top.

 

But for the point of this discussion id does appear to have a (probably OSB) sarking layer on top.

[scottishjohn]

the 20  houses built next to my current house.

making a small scheme  -built in about 1992 by robison &davison 

locally know as R&D 

or rough and dangerous 

they were all built with english type roof ,no sarking boards ,so there must be a loop hole somewhere or SE has assured planning that they will take wind loads ??

.

so yes its not a new thing houses being built by the bigger builders not using sarking board roofs in scotland 

I suppose it could be a balancing cost factor between   more skinner trusses +sarking and   thicker ones and no sarking 

I doubt it will be a wind loading factor that sways big builders  on which way to build 

Edited February 7, 2019 by scottishjohn

[makie]

It's purely because it is cheaper and doesn't make much of a difference

[scottishjohn]

once i get to a plan ,that is one thing I will try to quantify .both on cost +insulation value 

difference between sips panels and fully trussed roof and all the insulation etc .

and then non sarking type roof as an option as well 

roof on in a day is very attractive part of the sips choice