No not unless it is leaking. No leaks leave it alone. Replacing a roof is expensive. I replaced mine a few months ago and the cost came to 12,000.
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The answer will depend on the height of the pyramid - or, equivalently, the pitch of the roof.
You need to know how much a cubic foot of snow weighs. It depends on the sort of snow. There is 1500 cu ft of snow on the roof.
1296
With the available information, you cannot. You also need the pitch or the height of the roof above the height of the enclosure.
You need more information to answer this question. A few of the items needed would be the height of the room as well as specifications on the framing (ie. 16" center verses 24" center). Does this addition need a roof? If so what type of roof do you want? Do you considers the decking on the roof part of the lumber? Are there windows? Those will need to be framed out. How many doorways. Etc... As you can see there are so many variables it would be impossible to say based on your question. The ceiling will be 8 foot, The centers will be 16" it does need a roof dont include the decking no windows