The higher the r value the greater the insulation performance.
R value of roofing materials.
This comprehensive guide to roofing materials is all the research you ll need to evaluate the top choices for residential re roofing and new construction projects in 2020 what to expect.
Rsi r value système international is the metric equivalent.
It s important to think about r value when considering your roof project because by increasing the r value you allow your roof to keep warm air in during the winter and out during summer.
To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826.
To convert rsi to r value multiply the rsi by 5 67826.
R values and heat loss.
In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation.
Asphalt shingles wood shingles and shakes metal roofing concrete clay and fiber cement tiles natural and.
There are many websites on the internet which have imperial building material r value numbers but not so many with metric r value numbers.
Eps based claddings directly fixed on timber framing.
For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721.
Click here to go to our calculator to understand the real r value of a ceiling system or wall system with gaps in the insulation.
When determining how much insulation you need don t guesstimate calculate.
In construction the r value is the measurement of a material s capacity to resist heat flowfrom one side to the other.
R value of building materials material r inch r thick ness fiberglass inch 3 00 1 inch 4 00 inch 6 00 extruded polystyrene inch 3 75 1 inch 5 00 1 inch 7 50 foil faced polyisocyanurate inch 5 40 1 inch 7 20 1 inch 10 80 siding materials hardboard inch 0 34.
In this guide we ll cover the following most common roofing options.
When buying various insulation materials you will almost always see an r value quoted for the material.
The following table is in metric form.
R value measures how well certain building insulation materials can resist heat.
In general higher r means more resistance to heat loss and therefore lower heating or cooling bills for the building.
The r value of a material is its resistance to heat flow through the material.
For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15.
Know exactly how much you need with our project calculators.
This webpage calculates the r value of walls roofs and suspended floors for most insulation material r values.
Some of the possible material combinations may not be suitable for actual constructions i e.
The higher the r value the more insulation the material provides by limiting airflow between outside and inside the building.
It uses the iso thermal planes method the same method as used in nzs4214 2006.
Types of roof insulation.
