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Overview
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The six steps
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The process of restoration begins
with the removal of completely
decomposed wood, as shown in examples #1 & #2. The
restorable wood is
then impregnated with the Lignu Impregnating Resin (example
#3).
Missing portions of the original wood
are then replaced with a filler
(example #4) made largely from the natural resins of
wood, as is the
Lignu Impregnating Resin. When the filler cures, it
will have a
flexibility comparable to the original wood.
The filler may be easily shaped to the
original contour (example #5
and #6). Before painting, one more coat of the Lignu
Impregnating
Resin helps the paint bond better to the wood and filler.
The final result is deteriorated wood
restored, capable of many
additional years of service.
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Glu-Lam Impregnation Comparison
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These two laminated beam sections
were adjacent slices, cut
side-by-side and one treated, so you could compare the
almost-identical wood before and after impregnation.
The fungi that
cause rot leave an abnormal porosity in apparently-sound
wood near the
decay. This is why rot starts up again behind conventional
repairs
with other products.
The slice on the right was treated with
Lignu ® Impregnating Resin
dyed blue, so that regions of abnormal porosity would
be visible after
impregnation. The wood was placed in a shallow tray
and the liquid
wicked up into the wood. In only a few minutes, in regions
where the
fungi had eaten the wood, the dyed resin was now visible.
The Lignu ®
Impregnating resin penetrates deteriorated wood much
more than sound
wood, because it has more porosity.
These regions are now impregnated with
a highly rot-resistant and
water-repellent resin, and useful mechanical properties
are restored.
This treatment improves the ability of the wood to resist
further
deterioration.
This is the first step in the restoration
process. When finally
painted, the impregnating resin glues the paint to the
wood, so it
sticks better and lasts longer.
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IMPREGNATION OF WOOD
Facts about the Lignu technology
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The above diagram shows the distribution
of stress failure for naturalwood specimens in a standard
test fixture.
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This diagram shows the distribution
of stress failure for woodspecimens that have been impregnated
with the Lignu ImpregnatingResin.Note that the average
strength has increased to 141% of original.Note also
that the strength of the weakest untreated specimens
hasbeen doubled by the impregnation treatment.
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Depth of impregnation
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A blue dye was added to our impregnation
in order to show the depth of
penetration. Notice how penetration follows the pattern
and direction
of the grain. Notice the extent of impregnation into
the deteriorated,
porous wood near the nail, which penetrated the wood
and thus allowed
fungi to enter and follow the grain.
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Water absorption after water immersion.
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The water absorption of wood specimens
before and after impregnation
is shown, for a deteriorated Douglas fir 2 x 2 and a
new cedar
shingle. In both cases the water absorption is dramatically
reduced,
but it is clear that the wood is still allowed to breathe
naturally,
otherwise the water absorption after impregnation would
have been zero.
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- Before impregnation of
deteriorated Douglas fir.
- After impregnation of
deteriorated Douglas fir.
- Before impregnation of
new cedar shingle.
- After impregnation of new
cedar shingle.
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In America Lignu ®
Impregnating Resin is also known as MultiPrime
Learn
more
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Essay 1
An introduction to paint, varnish and the Lignu Resin on wood |
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Essay 2
Clear coatings on wood |
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Essay 3
HOW DOES WOOD ROT? |
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Essay 4
How to get more life from paint on old, weathered wood |
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Essay 5
THE HISTORY OF WOOD RESTORATION |
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Essay 6
HOW TO BUILD AND MAINTAIN EXTERIOR WOOD STRUCTURES |
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Essay 7
Definitions |
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Essay 8
What's the Matter? |
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