Reply by rossn

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Posted on Sander for cedar siding

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72 posts in 707 days

#1 posted 09-22-2020 10:16 PM

Yeah, wish I had extra persons, but I have to choose what I have contractors do or not—I have two very large remodels going on.

The purpose of sanding the wood isn’t to make it rough, rather to open the grain and cells; I am wanting to have the smooth side out. Not much holds up against Colorado UV, for semi-transparent and especially transparent coatings. I will be better on the soffit, and need to make sure it lasts as long as possible, as it would be very expensive with a lot of scaffolding to re-coat it. So, getting a good first coat is very important.

The guy at the real cedar association said that it should be sanded to open up the pores, not chemically treated. Unlike many other woods, cedar doesn’t have the sap and risk mill glazing, rather the soft grain gets crushed through planing. Longevity relates to how well the stain penetrates.

Doing a sample water penetration test… 2 mins, with 2 drops. Can you guess which side is sanded, which side isn’t?

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