So what can you do to ensure you don’t end up in this situation?

• Always check our technical manual for the latest product information, particularly nominal thicknesses, that hard copy Pink Batts catalogue you have on your shelf could be 10 to 20 years old (we have been around for nearly 50 years now!)
• Remember you need at least 25mm clearance between the insulation and the underside of the roof underlay
• Ceiling insulation is soft and fluffy, while we try our best to give a nominal thickness, remember this is not a maximum. It is the thickness at which we guarantee the label R-value will always be achieved.

However if you do find yourself in this situation there are still a few ways to remedy the problem.

One is to use the calculation method and increase the R-value of the product in wall cavity and use a lower R-value in the ceiling. In this case use the 90mm Pink Batts Ultra^® R2.8 Wall product in the wall and ceiling, normally works. Whether this will work depends on the area of the wall versus glazing.

Another trick if the house is almost built is to use the 90mm Pink Batts Ultra R2.8 Wall product in conjunction with the 40mm Pink Batts® R1.0 Masonry Wall product in the ceiling. This gives an R-value of 3.8 at a thickness of 130mm but can only be used if the depth of the rafter is great than 155mm.

Just one final thing -- while Pink Batts wall products can be used in the ceiling cavity, Pink Batts ceiling insulation should never be installed in the wall cavity. Pink Batts wall products are specially designed to be stiff and sit perfectly in a wall cavity with out compression or slumping. Ceiling products are the wrong thickness and stiffness for the wall cavity but just perfect for the ceiling.