My soffit area needed to be opened, my house was built in the 1950's and the fascia wood is a 1" board that were nailed in, I was told that normally it is a 1/4" plywood that is used for the fascia wood and they are screwed and not nailed. Is this true? Is 1/4" plywood used today for fascia wood and are they screwed in or nailed? Who normally does this kind of work? Is it a carpenter and is a siding installer licensed do this kind of work?
I would normally not use plywood. I usually nail in cedar right to the rafter joists... depending on what material you're using whether it be aluminum, cedar, metal, pine, vinyl.. depending on the material its either nailed, screwed, pinned, or stapled in...
I can't see why you'd use plywood unless its a backing for a material.. even then you'd probably want your roof to breathe to avoid moisture build up...
But that is only my two cents and opinion.
Usually if a strip of 1/4" plywood is being used, it is being covered by aluminum capping (aluminum fascia). If your wood is to be left visible and open, it should be treated and stained (and not plywood).Siding installers and Roofing Installers are capable of making this change. But if they are covering with aluminum most installers are going to use the cheapest method.
Early days was thicker wood, if any soffits even, then they went to cheapo plywood, sometimes with some screen covered holes or nothing, half the time there was no proper venting of a roof either just a couple louvered openings in end gables, heating fuels were cheap, walls were only 2x4 exteriors & insulation was minimal, not like now. A roof "breathes" like it should to cool and heat, soffit venting in aluminum and vents on top, insulation and vapor barriers in attics, if you are doing a reno, "upgrade", don't just put the same 60 year old technology back in.
If you're planning on changing wooden soffits over to vented soffits just be cautious that they're permitted as the installation should meet current Code. They are not allowed within 1.2 m of a property line or an imaginary property line between two buildings.
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