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Building Control: Numpty First Time Questions

Nothing on that page mentions a test where the fire protection boards are fixed to a steel beam via a timber sub-frame. The certificate for such a test does not exist.
 
because again the plasterboard is the protection.....of everything that lays behind it....eg your ceiling joists.
 
a fire test for plasterboard fixed to the underneath of stairs does not exist - point proven. The absence of anything just proves absolutely nothing.
 
freddiemercurystwin said:
Timber fitted into the web of a steel beam can (when heated during a fire) twist, bow and bend at a different rate to the steel beam it was once neatly fitted to.

So now you have two materials that were once perfectly aligned are now fighting against each other, inside a tightly fitted plasterboard surround.

Now consider the screws holding the plasterboard against the timber, are hundreds of degrees celsius. The threads of the screws where embedded in the timber are now burning the timber, if those screws lose their grip and fail and pull out, then the plasterboard can become detached from the beam and the protection is lost.
Click to expand...
Sorry that is all pseudo-science at best and nonsense. at worse.

Timber, like the 6x2 in noseall's image does not bend and twist, that's just wrong.
And the temperatures involved in getting it to spontaneously combust while it's sandwiched between plasterboard and a beam are way beyond what would be expected during the time that building regulations require it to be, or the time the rest of the house has burnt to a pile of ash. Remeber that air is a crucial part of the combustion process. What air is around this sandwiched timber?

But, in addition, lets suppose the limber does in fact twist like teddy boy snake listening to Buddy Holly, the timber is actually bolted to the beam!

The same "hot screw paradigm" applies to every bit of plasterboard currently accepted for fire protection - partitions, ceilings, roofs you name it. Same principles but curiously acceptable to all regulatory compliance purposes.
 

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