In this ‘spot the defect’ study we take a look at cavity wall insulation. You know…that foamy stuff in the walls that keeps us toasty in our homes and saves energy?

So let’s cut to the chase, can you see what’s wrong in the pictures below?

a)

b)

 Here are the key defects in each picture:

a)   Insulation batts were found incorrectly pushed into the cavity with cut edges facing the outer leaf.

b)   Partial fill insulation batts were poorly installed against the inner leaf, the remaining cavity was less than 50mm and bridged by mortar droppings allowing a path for water to reach the inner leaf.

For more information on partial fill insulation why not check out the following article "How to install cavity wall insulation to minimise heat loss in your building".

By Frzana Ferguson