Back Priming Cedar Siding

Back priming natural wood siding helps control rotting mold build up cupping and movement in the wood ultimately giving your siding and your stain finish more longevity.

Back priming cedar siding.

Not only does back priming prevent rot it prevents bowing cupping. Although intended primarily for restoring horizontal wood surfaces such as decks these products generally work almost as well on vertical surfaces. Regardless of vapor barriers they don t help the siding itself. Prime the cedar before you paint it.

Back priming helps prevent paint from peeling by reducing the amount of water vapor that passes through the wood. Back priming is the best way to treat any exterior wood. This is called extractive bleeding a naturally occurring process that does not affect western red cedar s properties. These are tannins from cedar wood leaking through a water based primer.

What that means is that you can put primer on the cedar siding but brown stains will come through. Priming western red cedar helps the wood s natural properties stay put. Without a primer tannins from within the cedar mix with moisture and seep to the wood s surface naturally staining and discoloring the surface. You have to use oil primers on cedar siding.

Prime all sides and end grains or cuts before installation. It is strongly recommended that you go with the two coat system for protecting your cedar siding. It occurs either when heated or air conditioned air from the house radiates out and meets the cold or hot outside air. A primer with a paint top coat will have a significantly longer service life than will a single coat of paint or even a solid stain.

Uncoated weathered western red cedar siding or trim can often be restored to its original color by applying commercial products called cleaners brighteners or restorers. Back priming consists of applying a coat of primer to the reverse side and edges of boards before installing. All siding takes on seasonal moisture from sources as diverse as direct rain wicking and vapor diffusion through the wall assembly. Importance of back priming when installing wood siding.

Where is the trapped moisture coming from.