Ok so I have attached a 2 sided massive tarp to my house and then added tarps around the sides to create walls. It's built over my back porch and a concrete patio with some ground showing and some ground covered with pallets. Needed a workshop so this is my alternative. Did this at my other house and didn't have this problem as much but also had I think 2 for sure but maybe 3 tarps as the ceiling. I have a propane heater, an electric heater, a regular household standing fan and a big stand up shop fan. And a hole for ventilation but maybe it's not big enough or something.

This tarp is like raining on the inside is the best way to describe it. Right directly above the heater is ok but the rest of it is a downpour. I have the tarp sloping downward from the house but I'm at a loss on how to stop all of this condensation. Anyone with more knowledge about this?

I have tried not using the propane heater but that made things worse. Like when it's raining. Electric heaters may answer the question just hate what it will do to the power bill.

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    I’m voting to close this question because it should be moved to diy.stackexchange.com
    – user2169
    Feb 14, 2021 at 15:50
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    The propane heater will be generating a lot of water, as will any gas or liquid fuel heater. The tarp directly above the heater is warm enough that the water does not condense there. There is a surprising statistic that one pint of paraffin produces 1¼ pints of water (as vapour). I suggest you get a solid fuel stove with a flue vented to the outside. Feb 14, 2021 at 18:48
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    Any double layer (slightly spaced) roof will keep some heat in, both reducing the rate of condensation and reducing the need for heat. If that means you turn down the propane heater, it will further reduce your condensation. With big gas heaters you need quite a bit of ventilation anyway
    – Chris H
    Feb 14, 2021 at 21:13
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    This lady is having a problem with a large tent which is outside. Who better to answer tent problems than TGO?
    – ab2
    Feb 14, 2021 at 22:53
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    In reply to the now-deleted answer (which should probably be reposted as a comment) - ground cover may help if the ground is wet. Warm air evaporating water from the ground would add to the condensation, but a groundsheet would block this
    – Chris H
    Feb 15, 2021 at 10:55


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