I have run in to these problems more often then I want to remember. I've done a lot of DIY. Built everything from homes to kit cars airplanes and heat-pumps.
I have learned its better to pay the price for proper or better than average materials as you are saving money doing it yourself. There is a whole lot of pain when you have to do it again. It may cost more, as you have purchased the inferior materials and now you have to re-do it with the proper material.
Just my humble advice.
Randen
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