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Unable to change R value in the 'Increase R value' measure for exterior walls and roof below a certain limit. Why?

I have been trying to change the R value for exterior wall and roof using the 'Increase R value' measure in Open Studio, but it refuses to accept any value below 6.25 for exterior wall and 22.32 for roof. I do not quite understand why this lower limit is set on my file. Can I please get some insight on this?

Unable to change R value in the 'Increase R value' measure for exterior walls and roof below a certain limit. Why?

I have been trying to change the R value for exterior wall and roof using the 'Increase R value' measure in Open Studio, but it refuses to accept any value below 6.25 for exterior wall and 22.32 for roof. I do not quite understand why this lower limit is set on my file. Can I please get some insight on this?

Unable to change R value in the 'Increase R value' measure for exterior walls and roof below a certain limit. Why?

I have been trying to change the R value for exterior wall and roof using the 'Increase R value' measure in Open Studio, but it refuses to accept any value below 6.25 for exterior wall and 22.32 for roof. I do not quite understand why this lower limit is set on my file. Can I please get some insight on this?