Insulation for brick outbuilding home office conversion

[dan7827]

Hi all,
I'm attempting to convert an old double brick English bond outbuilding to a home office. One of the biggest hurdles & conflicting information seems to be insulation.
UK climate so...cold & rain. I'm not too fussed about thermal rating currently but with it being an office electronics need to be safe.

What options have you had success with?
- walls: ???
- roof: batons aren't very deep which I think leaves the only option of surface mounted insulated plasterboard

Any help appreciated!

Cheers

 

[JP_]

Not done an outbuilding, but inside I've stuck 50mm kingspan to walls and that works a treat. Think my loft conversion had 50mm between rafters (might have been more) then overboarded with 25mm, then plasterboard. Could you extend the roof rafters / batons to make them deeper to hold more insulation?

 

[^woody^]

Just look at any of the "garage conversion" threads

 

[dan7827]

Just look at any of the "garage conversion" threads

From various sources like insulation manufacturer websites I've been led to believe that the different construction, standalone outbuilding, out in the elements, lack of damp course, etc makes it a 'different kettle of fish' as it were.

Happy to stand corrected if there's a definitive guide for this application.

Not done an outbuilding, but inside I've stuck 50mm kingspan to walls and that works a treat. Think my loft conversion had 50mm between rafters (might have been more) then overboarded with 25mm, then plasterboard. Could you extend the roof rafters / batons to make them deeper to hold more insulation?

That's one option I've heard. Only difference being damp proof slurry on the bottom of the walls & insulated PIR board such as kingspan, dot & dabbed to the wall.
For the roof since we'll already have that board it made sense to also use it and screw to the narrow rafters. Rather than expending them all, getting separate insulation & plasterboard, cutting up insulation in to smaller pieces & joining with aluminium tape.

This isn't a loft so I guess moisture is it's biggest enemy. Again, happy to be corrected on what I understand the options to be currently.

 

[^woody^]

From various sources like insulation manufacturer websites I've been led to believe that the different construction, standalone outbuilding, out in the elements, lack of damp course, etc makes it a 'different kettle of fish' as it were.

Happy to stand corrected if there's a definitive guide for this application.

No, an outbuilding needs the same work as a garage.

The principles are exactly the same - damp barrier to walls and floor, insulate walls, floor and ceiling, line the walls, floor and ceiling.

 

[JP_]

I'd use Everbuild pinkgrip foam to fix kingspan to the walls, and tape joins with silver insulation tape, this will create a moisture barrier.