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Wood repair materials should perform through the service life of a repair,
sealing out moisture by maintaining integrity despite the rain, snow,
sunlight, and daily temperature and humidity changes.
One of the greatest dangers is premature failing of repair materials caused
by constant expansion and contraction of the wood itself. Bonding of the
repair materials must remain intact to the surrounding wood. The repair
compounds must have the strength and flexibility to withstand the natural
stresses of expansion and contraction. |
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FRACTURING OF MATERIALS
Conventional epoxy repair materials fracture under the stress
of constant movement. Most epoxy repair compounds lack the flexural
strength required.
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BONDING FAILURE
The forces of expansion and contraction cause inferior materials to
peel away from the wood. Conventional epoxy repair materials lack the
high peel strength necessary to resist expansion and contraction.
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POOR SURFACE PREPARATION
Leaving the decayed and damaged wood behind greatly compromises the
bonding strength of the epoxy repair material. Decayed wood, fungi
spores, dirt, air-born particles carried by rain, oils, and moisture
all inhibit proper bonding of repair materials to a sound surface.
Therefore it is imperative that all contaminates be removed to a
clean, sound subsurface. Impregnating decayed wood fibers with epoxy
provides only a short term solution.
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Please note
and give some thought to all the claims that these products make .
From their limited lifetime warranties to getting someone to take
responsibility for their products. |
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MARINE EPOXIES
Epoxy materials designed for marine applications gain their flexural
strength by the use of fiberglass cloth or the laminating of thin
strips of wood. The use of these materials are not practical in the
repair of wood in architectural applications.
BRITTLE REPAIR MATERIALS
Polyester repair compounds (auto-body fillers) and conventional epoxy
consolidate materials filled with air, micro-balloons, and fillers
greatly reduce the flexibility and peel strength, only providing a
short-term solution.
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Replacement
of wood is normally the best repair method but take some of these into cost
saving ideas into consideration. |
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