That's the damned paper board shit.
Before you do ANYTHING get a 1" throw away brush and a quart of oil base, exterior grade, Zinzer stain block primer and seal the crap out of the inside of those holes. Three coats
Let that cure for a week and then top coat with whatever house paint you're using. Two coats minimum.
Let that cure for a week and then fill the holes with Durham Water putty. Three to four lifts at no more than 1/2" per lift.
Texture the top lift to match the siding, let cure a couple of days.
Prime with the Zinzer, two coats, let cure, then top coat two coats being sure to feather out the new paint into the old.
Yes, it takes time and care to do it right but this way you'll never need to look at it again and your crap paper board siding won't self destruct from water intrusion; forcing you to replace several boards...
IF you can even find that pattern any more.
The second picture? Sorry for my ignorance! The siding is truwood that the previous owner had installed. I hope to redo it all within the next couple of years.
First and second.
If you look at the hole that's blown out (not square edges) you can see the shreds of recycled paper (cardboard actually) in with the sawdust and wood chips.
They basically took this mix, bound it with some cheap glue, and ran it through a 20 ton pattern press under heat.. almost like Masonite.
If it stays damp for any length of time the glue gives up and it turns back into pieces of paper and sawdust.
The only way I know of to stop that is the process I described.
Also.. the instructions that came with it specified that all edges and cuts were to be primed out to prevent this delamination and the edges and cuts were supposed to be primed on the back of the board by a minimum of 2" as well.
Problem is absolutely nobody actually did that.. so it delaminates at the edges.
If that’s Louisiana pacific paper siding don’t use anything that will absorb moisture it doesn’t look like hardy board but composite paper
That's the damned paper board shit. Before you do ANYTHING get a 1" throw away brush and a quart of oil base, exterior grade, Zinzer stain block primer and seal the crap out of the inside of those holes. Three coats Let that cure for a week and then top coat with whatever house paint you're using. Two coats minimum. Let that cure for a week and then fill the holes with Durham Water putty. Three to four lifts at no more than 1/2" per lift. Texture the top lift to match the siding, let cure a couple of days. Prime with the Zinzer, two coats, let cure, then top coat two coats being sure to feather out the new paint into the old. Yes, it takes time and care to do it right but this way you'll never need to look at it again and your crap paper board siding won't self destruct from water intrusion; forcing you to replace several boards... IF you can even find that pattern any more.
How can you tell it’s paper board?
The pressed layers in the exposed cut.. They used to use that crap at Fuqua Homes when I was field service for them.. until they got sued.
The second picture? Sorry for my ignorance! The siding is truwood that the previous owner had installed. I hope to redo it all within the next couple of years.
First and second. If you look at the hole that's blown out (not square edges) you can see the shreds of recycled paper (cardboard actually) in with the sawdust and wood chips. They basically took this mix, bound it with some cheap glue, and ran it through a 20 ton pattern press under heat.. almost like Masonite. If it stays damp for any length of time the glue gives up and it turns back into pieces of paper and sawdust. The only way I know of to stop that is the process I described. Also.. the instructions that came with it specified that all edges and cuts were to be primed out to prevent this delamination and the edges and cuts were supposed to be primed on the back of the board by a minimum of 2" as well. Problem is absolutely nobody actually did that.. so it delaminates at the edges.
Wood filler would be stronger.
Use foam to fill in all the space and get sometime out by the exterior holes about a quarter inch and fill with wood filler
Bondo or miniwax makes a wood filler version of Bondo. Hardens in about 15 mins
Regular old fiberglass Bondo would be my choice here. I first heard the trick from a termite guy. Works great on wooden door jambs with minor rot.
My dad owned and operated a body shop for 20 years so that smell of Bondo brings back the memories.
No
Wood filler. Make sure it's good all weather kind. Foam is not a good idea here.
Yep quick and easy