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# R Value for snow loads in Tedds

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## R Value for snow loads in Tedds

(OP)
Hello,

I have a question about the R value (Thermal Resistance) in Tedds when referencing ASCE 7-05.
How do you calculate it? My Ct value is 1.00 but i dont see a way to calculate thermal resistance which is defaulted at 30 in Tedds.

Sorry if my formatting isnt correct this is my first post on eng tips.

Thanks

### RE: R Value for snow loads in Tedds

Could you give us some more information on what Tedds is asking for when it is calculating some thermal resistance due to Snow Load on a building, etc.

I was not aware that there was any capability to add thermal resistance due to snow load.

Jim

### RE: R Value for snow loads in Tedds

(OP)

Heres a picture of the menu where it asks for R

### RE: R Value for snow loads in Tedds

Tedds is asking for the R-value of the roof insulation. This goes into calculating the Warm Roof Slope Factor Cs in Figure 7-2 of ASCE 7. Your architect should be able to tell you what the R-value is on your project.

### RE: R Value for snow loads in Tedds

(OP)
okay, as a followup question - If i already know my Ct value, how does the R value effect my snow load?

### RE: R Value for snow loads in Tedds

If you have a normal heated building with a high R value it is going to slow down the heat loss through the roof of the building, especially if you have also chosen a ventilated roof surface. In other words the snow might take a long time to melt off and the snow load on the roof will remain in place along time.

Jim

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