Loft floor joists for long span

[Logidex]

Thanks all.

I have been granted planning permission for the project. It came as a pleasant surprise given the size of the extension: two double bedrooms, two en-suites, double hip to half gabled conversion, large box dormer to rear and a more normal sized pitched roof dormer to the front.

I've had an estimate from Telebeam for £11k (see earlier post) hence why I am looking for alternative technologies. But so far this seems to be limited to flitch beams and easi-joists. I'm surprised there isn't any other supplier of aluminium joists (that I could find).

Since I don't need telescopic beams, is there any reason why I can't use simple aluminium box section or even more cost effective, steel box section beams?

 

[noseall]

I have been granted planning permission for the project. It came as a pleasant surprise given the size of the extension: two double bedrooms, two en-suites, double hip to half gabled conversion, large box dormer to rear and a more normal sized pitched roof dormer to the front.

Sounds horrific.

 

[tony1851]

Sounds horrific.

Beauty is in the eye of the beholder

 

[Norcon]

How about a set of these....?

Peri formwork girders. Any size up too 6m available and up too 17m available on request.
These will beat any engineered joist on the market imo.

They are highly durable, fully treated and comply with stringent German load bearing standards and built to carry extremely heavy loads..
(ie- wet concrete )

◾Permissible bearing force: 28.00 kN
◾Permissible bending moment: 7.00 kNm
◾Bending stiffness: EIx = 887 kNm² Ix = 8.064 cm4

Not too shabby eh?