Wood burner distances in lodge

[ChrisF8]

Hi, 

 

I’ve been renovating a summerhouse style outbuilding and have brought a log burner for additional heat. I was hoping to get some advice on distances to the wall as it’s a little confusing when it comes to non building regs style installations.

 

Ive attached images of the outside of the building and the inside where I wanted the log burner to fit. I’ve put up 9mm cement board (it will go all the way up to the roof beams) and I was planning to tile over it using fire resistant adhesive, I’ll build a hearth in the same way (raise on bricks) and use a 3.5m twin wall all the way down burner.
 

My question is…the back of the burner says 450mm from the back to combustibles, does that distance change given the tiling and cement board? If so, what is a safe distance?

 

 

[Nickfromwales]

@ProDave squeezed one into his static, so I guess there’s a way   

[saveasteading]

2 hours ago, ChrisF8 said:

450mm from the back to combustibles, 

If a material cannot burn then it is not combustible ... discuss.

Actually I did, with bco. I prevailed tho they found some excuse that meant they had not formally lost the argument.

 

An otherwise combustible material, eg timber cannot burn without oxygen, so protect it.

 

But eps might still melt.

[Onoff]

@zoothorn put one in his riverside shed / cabin as well:

 

 

Edited November 11, 2025 by Onoff

[ADLIan]

'Non-combustible' is normally defined as a reaction to fire of Euroclass 'A1' (to BS EN 13501-1) so this gives the starting point. Check MIs - they will state minimum distance to combustible materials and may give a reduced distance if shielded by a non-combustible product and an airspace.