UFC 4-150-07
19 June 2001
3-2.3.4 Coatings for Wood Buildings. Wooden structures continuously
immersed in seawater or subject to immersion during tidal changes are not
usually painted except for marking identification or location. In general, coating
wood is confined to structures such as buildings located in waterfront areas to
protect the wood from weathering and for appearance. Surface preparation of
either previously coated wood or uncoated wood may consist of the following
procedures:
100% removal of biological growth,
(b) removal of unsound coatings,
(c) removal of surface contamination such as oil, grease, dirt,
(d) light sanding of sound coatings and exposed wood.
Two coating systems may be used for either previously coated wood or
uncoated wood as follows:
40% volume solids, exterior latex (water-based): 1 or 2 coats at
0.05 to 0.15 mm (1.97 to 5.9 mils) dry film thickness (DFT)
55% volume solids, flexible acrylic waterborne (water-based): 1 or 2
coats at 0.1 to 0.3 mm (3.94 to 11.81 mils) DFT.
3-2.3.5. Protection of Timber Piles. All timber piling in the marine
environment, including piling properly treated, are eventually attacked by wood
destroying organisms. Pilings are also commonly subjected to ice lift and
abrasion. As a result, protection with plastic wraps is often required, in order to
minimize the impact of these environmental factors. In tropical environments,
such as Roosevelt Roads, Puerto Rico, even dual-treated pilling should be
wrapped.
The use of plastic wrapping to protect piling against marine borer
damage, at and below the waterline, does offer considerable economic benefit by
effectively eliminating borer damage, reducing future repair costs. The polyvinyl
chloride (PVC) or polyethylene wrapping smothers borers already in the wood
and prevents the entry of more borers. Installation of barrier wraps are described
in repair technique TR-3 in Chapter 6. Fender piles pre-wrapped with a thick,
heat-shrink polyethylene provides a slippery surface that prevents exposure of
untreated wood due to wear from camels. An example of a molded polyethylene
jacket used for ice protection is shown in Figure 3-4.
3-11
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