Causes:
Hardboard siding is reconstituted natural wood created by
reducing natural wood to fibers, adding resins, and then
pressing the fibers together into panels. It can be either
tempered or standard. Tempered board is denser and has a
higher moisture resistance. Standard hardboard should not
be used outdoors in areas where it will be directly
exposed to the weather. Peeling in hardboard is often due
to poor maintenance of the coated surface. It generally
originates at butt joints and drip edges. Water contact
directly with bare hardboard in these areas eventually
penetrates into the board to repeatedly permeate and
expand the compressed wood fibers in the board. The
swelling process is irreversible, resulting in
delamination of both the paint film and the board.
Solution:
Whether supplied bare or factory primed, hardboard must be
primed again.
Caulk and prime all joints and bare edges to avoid contact
with water.
Check coated hardboard surfaces regularly to detect
possible areas of deterioration or cracking before failure
occurs on a large scale.
Where cracking or peeling is observed, scrape and sand the
area immediately, then prime, caulk and topcoat. |
