Fixing framework to stramit board flat roof?

[matt moore]

We have an installation to install on a flat roof constructed of Stramit Board. This is basicly Straw board with a thin layer of concreate on top then covered in the felt and tar.

This boarding is approx 250mm thick so coach screws through to the wooden joists are out of the question, i was thinking of resin fixing but thought i would ask opinions and see if anyone has any experience?

Thanks in advance.

 

[SolarCity]

Are you talking about resin fixing to the strammit? I doubt VERY much if that would suffice. I would say fix to the timbers underneath.

 

[matt moore]

Upon further investigation we have found that it is not Stramit board as such, but a straw board bonded with cement. This board is 100mm thick (approx) with a further 150mm screed of of what appears to be concrete on top. We have currently installed 2 threaded rods into the roof in an inconspicuous place using resin and once set are going to carry out some stress tests. I will let you know our findings.

 

[Worcester]

I Suggest you have a look at UNIRAC, they are a Hilti Compnay so the Hilti rep may be able to help you, they have some interesting fixing solutions.