I`m building a dividing wall with a doorway across my integral garage to split it into two rooms, a dining room and a small storage area at the garage door end.
After a site visit the LABC officer tells me the main criteria to meet will be the thermal insulation values of the new habitable room. They cant advise what is the best material or give me any tech info re values to be acheived (at this stage).
What i`m asking here is taking into account that one end of the garage has a steel garage door, what is the best insulating material to use? How does polystyrene slab compare to the rockwool type material?
Also does anyone have any info re the best type of internal door to install for heat retention etc? I am advised that a fire door will not be necessary.
Any info appreciated.
The U-vaalue that you need to achieve is 0.3W/m2K the same as for an external wall.
I recommend the use of a polyurethane insualtion (eg kingspan or celotex, the type with silver layers on surface) - it give better thermal performance compared to the same thickness of polystyrene or quilt.
Plus you don't have the possibility of the insulation slumping down which can occur with outher forms.
Polyurethane insulating coatings offer extreme durability, which is four times stronger than traditional epoxy! It is also 98% more flexible, which means that your garage flooring finish is protected from cracking and it is even chemically resistant to salt, oil, gas and other chemicals that commonly stain garage floors.
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