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Are you not expecting to see some sort of sheathing behind the siding? In order to spray foam properly from the outside you would need to see bare studs, and spray foam in the stud cavities. So that would leave you without sheathing, so you would need to re-install sheathing or at least wind bracing if we are understanding you correctly. To re-install siding afterwards you would be wise to create an air space so the exterior of the wall can dry. Here is our how to install siding properly video, and another on how to install a weather barrier. And read here for more information about choosing breathable weather barriers.
Most specifically, read our guide page to find the best way of installing exterior insulation to the walls of homes here
Let us know more details about our wall assembly and what is behind the siding if you'd like, and we may be able to be more helpful.
Exterior walls need greater protection because they are exposed to the outdoor elements. It is advised homeowners choose closed-cell high-density foam for exterior walls. Not only does it keep air and moisture out, but it also makes the exterior walls more structurally sound, adding strength to a home and making it more durable. Insulation in the exterior walls is more prone to becoming damaged, which is why it must offer superior strength and durability. High-density foam is ideal for exterior walls. Besides the added strength and protection it brings, there are other ahrefs= https //www.windsorsprayfoam.com/interior-and-exterior-walls.html benefits
.Exterior walls need greater protection because they are exposed to the outdoor elements. It is advised homeowners choose closed-cell high-density foam for exterior walls. Not only does it keep air and moisture out, but it also makes the exterior walls more structurally sound, adding strength to a home and making it more durable. Insulation in the exterior walls is more prone to becoming damaged, which is why it must offer superior strength and durability. High-density foam is ideal for exterior walls. Besides the added strength and protection it brings, there are other Benefits. Check out https://www.windsorsprayfoam.com/interior-and-exterior-walls.html