Roof Insulation R Value Chart Australia

Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.

Roof insulation r value chart australia.

What r value do i need. Here is a chart and map that details this information. Insulation r value chart australia. Insulation in zones 1 and 2 typically require an r value of 3 or 4 while properties in zones 3 to 7 will require an r value of at least 5.

Most insulation manufacturers will first list their insulation s r value for a one inch sample then they ll give you a chart demonstrating the other r values you can achieve if you install a thicker version of their product. The r value is a measure of a material s resistance to heat flow known as thermal resistance. The insulation must be water resistant and be continuous from the adjacent finished ground level to a depth of 300mm or for at least the full depth of the vertical edge of the concrete slab on ground. Know exactly how much you need with our project calculators.

As discussed earlier in australia the bca has specified the r value requirements for all regions across the country. You should of course see the manufacturer provided technical data sheet for the r value of specific products. The r value is a measure of the insulation batt s resistance to heat flow also known as thermal resistance. The greater the r value the greater the resistance to heat transfer and the greater the insulating effect and subsequent energy savings.

By looking at insulation as a long term investment spending a couple of extra hundred dollars on the right insulation now can save you thousands over the life of your home. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. R value of various materials. When determining how much insulation you need don t guesstimate calculate.

It s recommended that you install foil backed insulation in your roof to an r value of r1 0 or higher. Installing foil backed blanket insulation is also a great idea if you are building a flat roof or cathedral ceiling. The insulation must achieve a minimum r value of 1 0 in zones 1 to 7 and a minimum r value of 2 0 in zone 8. For a very good introductory overview article on r value see r values over at the website of.

Let s use the r value of iko s polyiso insulation enerfoil tm as an example. R value measures how well certain building insulation materials can resist heat. Building code of australia bca. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.