fire rating

[Dodgy-diver]

im building a timber framed house extension but as I'm only 350mm from boundry I need 1 wall to have a 30min fire rating

I'm using Hardie plank to clad the wall with but the building inspector says I need additional fire protection 

can anyone tell me the cheapest way out of this please

as usual its all costing more than I had guessed so running low on pennies

 

many thanks for any ideas

 

[wozza]

Can you use a fire retardant membrane?

[TonyT]

https://www.magply.co.uk/
 

 

[PeterW]

What is the full wall build up, and where does he want the protection added ..??

 

Quickest way is replace any outer OSB layer with cement board, and then the battens become the only issue but they tend to accept this.  

[nod]

This is quite common when your within a 1000 of a boundary

Your Architecht should have picked this up 

You will have to double up on your cement board

Two layers of 12.5 Staggering Horizontal and vertical joints 

Or add a fire curtain Which will cost more