I've explained before, you stay ignorant.
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Building Control: Numpty First Time Questions
- Thread starter asnoop20
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Nonsense.
How do you explain a regular ceiling cradling the plasterboard, with a beam in the floor space. v's timbers bolted to a beam?
Because one has fixings into a steel beam and the other doesn't.
And?
Both are protected with plasterboard and in both cases, each are fixed into wood.
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Because one is fixed into a timber ceiling structure, another is fixed in to a timber structure fixed to a steel member. Do you think plasterboard magically stops anything behind it from getting hot? It protects it does not make anything behind immune from the effects of heat. Steel and timber behave differently when heated (ie in a fire) and that's when the timber fitted to the steel can be separated from the steel, timber can twist and bow when heated, the steel may stay fairly stable, then the plasterboard can pop off as the timber bows and the screws are heated up and char the timber where screwed in and lose their connection. This is not particularly complicated noseall it's well founded science. That's why there is no test data available for plasterboard fixed to a steel beam with a timber sub-frame, because it doesn't work. Just because you've been doing it this way forever and your dopey inspectors have accepted it forever does not necessarily make it right. Be my guest and find a fire test from the likes of BG or Siniat or Knauf or whoever for a steel beam encased in plasterboard fixed to timber in the web.
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No.
Utter bollax. How can timber bolted to steel separate? Timber often behaves better in regards to heat.
In 1/2 hour - nonsense.
Once the steel has encountered enough heat to do what you say it is doing, i.e. twist like you say it is, explain how my method and your method stands up better?
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Please find the test data to back up your method, you won't because you can't because it doesn't exist because it doesn't work.
as the requirement is for all plasterboard gaps to be filled and fixings to be covered to achieve a 30 minute rating all the points you raise are mute and secondly in any domestic setting its to save a building from premature collapse not to prevent collapse, as 30 minutes is the proscribed time to exit a building, plasterboard installed to any situation in the proscribed manner will achieve that.
Yep more ignorant posters who don't understand how steel beams and timber sub-frames behave in fires when connected together.
we do but its not the issue you seem to have imagined.
It's not imagined, it's science, I'm still waiting for someone to show me that fire test where timber is used in the web of a steel ....
Because its the plasterboard that is fire tested not the structure that its fixed to, how else would we use timber joists to support floors or rafters to support ceilings when covered by plasterboard. The purpose is to provide 30 minutes before collapse, not to prevent collapse...
Wrong
I never knew that filling the void with timber bolted on was a no-no..............Its seemed to be pretty standard practice for many decades as far as I can tell
Im pretty sure Ive had it approved by S/E in the past, Ive certainly never had a BCO mention it
Im pretty sure Ive had it approved by S/E in the past, Ive certainly never had a BCO mention it
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