Plasterboard staggered?

[xdrive]

In most domestic situations you need 30minutes fire resistance apart from the roof members, how you achieve this is up to you, you do not have to use fireline boards

If the pink plasterboard is not used then how else can 30 mins be achieved? Double normal board?

 

[dontbelieveawordofit]

normal pb is rated at 30 mins.
fire boards are 60 mins .

 

[xdrive]

normal pb is rated at 30 mins.
fire boards are 60 mins .

As far as I know Normal plasterboard is rated 15mins and pink is 30 mins.

 

[frutbunn]

If the pink plasterboard is not used then how else can 30 mins be achieved? Double normal board?

Depends on the period required and d

normal pb is rated at 30 mins.
fire boards are 60 mins .

Ignore this comment its just nonsense, the test is to the entire flooring system not just the board.
12.5mm plasterboard can give 30 mins
12.5 + 15mm wallboard can give 60mins
But these are dependant on joist size, spacing, floor decking thickness, insulation in void etc., see link for further info
https://www.british-gypsum.com/tech...0-or-60-minute-fire-rated-horizontal-membrane

As far as I know Normal plasterboard is rated 15mins and pink is 30 mins.

see above.
As far as I know no one tests to 15mins, or at least in the UK as it would be a pointless excercise, no reference is made to 15mins FR in the B Regs.

 

[dontbelieveawordofit]

Ignore this comment its just nonsense, the test is to the entire flooring system not just the board.
12.5mm plasterboard can give 30 mins
12.5 + 15mm wallboard can give 60mins
But these are dependant on joist size, spacing, floor decking thickness, insulation in void etc., see link for further info

it was a ‘general rule of thumb’ statement.
you just literally copied and pasted what’s on british gupsum website.
he could have done that.
obviously he’s not going to stand a standard pb on edge in his loft and expect it to perform the same way as if its attached to a 100mm stud packed with fire rated insulation.

 

[frutbunn]

it was a ‘general rule of thumb’ statement.
you just literally copied and pasted what’s on british gypsum website.
he could have done that.
obviously he’s not going to stand a standard pb on edge in his loft and expect it to perform the same way as if its attached to a 100mm stud packed with fire rated insulation.

This used to be in the appendix of the approved document Part B, as examples of construction satisfying the B Regs (an idiots guide!), they no longer do this so you have to reference manufacturers information and verify its been tested etc. It was probably a hangover frpm the "deemed to satisfy" clauses from the older format pre 86 regs.. The examples I have quoted have been independently tested to BS 476 for a FLOOR situation.
Obviously a floor test would gives different results to a wall test, the certification makes this very clear. I only referenced the website to back up what I am saying is correct.
Can you reference where it states a "rule of thumb" is acceptable evidence of periods of fire resistance? Your rule of thumb did not state any thicknesses or number of layers is required, so presumably a single layer of fire line gives 1 hour and 9.5mm plasterboard gives 30 minutes, according to your "rule of thumb".

 

[dontbelieveawordofit]

This used to be in the appendix of the approved document Part B, as examples of construction satisfying the B Regs (an idiots guide!), they no longer do this so you have to reference manufacturers information and verify its been tested etc. It was probably a hangover frpm the "deemed to satisfy" clauses from the older format pre 86 regs.. The examples I have quoted have been independently tested to BS 476 for a FLOOR situation.
Obviously a floor test would gives different results to a wall test, the certification makes this very clear. I only referenced the website to back up what I am saying is correct.
Can you reference where it states a "rule of thumb" is acceptable evidence of periods of fire resistance? Your rule of thumb did not state any thicknesses or number of layers is required, so presumably a single layer of fire line gives 1 hour and 9.5mm plasterboard gives 30 minutes, according to your "rule of thumb".

you gave your initial statement based on a floor test. then tried to salvage it. now your’e trying to make yourself look credible again by trying to discredit my ‘general rule of thumb ‘ statement by trying to imply that ANY builder would use a 9.5mm pb in even , lets say a stud partition.

all he has to do is use firelines like i tried to steer him towards at the start and which you tried to steer him away from.

 

[dontbelieveawordofit]

why would you instigate a dispute when you should know full well that the answer is there is no answer, unless your’e actually standing in his house presented with his situation.
sounds like someone else i know on here.

 

[xdrive]

What I gather is

12.5mm normal plasterboard will suffice.
Fire board would give more protection.

Cheers