Remodels are always interesting to say the least. You never know what
is behind a wall or under a floor until you tear into it. The job we
are working on now also has an addition to the existing home. To make it
even more challenging, the original home is a timber frame design. For
those who are not sure what timber frame really means, think of
a building with only a skeleton of large vertical posts, horizontal beams and rafters. Think of this 'frame' as a finish detail of the project, to be left uncovered as a strong visual element of the final product.
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Timber 'Frame' |
Now build another standard stud
framed wall and roof outside the 'timbers' to carry the plumbing,
electrical and insulation required for a modern residence and you get a
feel for this style of building. This 'post and beam' construction goes
back many centuries because of it's ability to accommodate the fairly
crude framing members demanded by the tools available at the time.
The term "barn raising" is appropriate here. With good organization, a
weekend work party was often used to assemble a complete frame in one long
weekend.
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Fall Progress |
But enough about timber framing history for now. This
post was supposed to be about the challenge of a good remodel/addition.
Partly because of our late season start our first priority was to
complete any roofing details. In most modern timber frames the visual
ceiling is made with 2x6 tongue and groove material nailed on top of the
rafter timbers. A frame of 2x rafters is then built up from here. The
main purpose of this sub-structure is to hold rigid insulation and
provide the base for plywood sheathing, roofing paper and finally the
roofing itself. For us this phase meant removing the metal roofing
from above the two covered porches we were converting to living
space and filling the hollow cavities with insulation. Considering the
relatively small areas we were working with it was more cost effective
to install sheets of 'Thermax' foam insulation (polyisocyanurate)
instead of the spray foam used in the original construction. With
an insulation value of about R-7 per inch this material rates as high as
any material available, in our case allowing an insulating value of
about R-38 (a little above code for cathedral ceilings in our area). Once the new insulation was in place we covered the joints
with foil tape and sealed the edges and any gaps with spray foam. After
reinstalling the plywood sheathing we replaced the outdated tar paper
with a self sealing rubberized asphalt material commonly used in our
area. The version we are now using (Titanium PSSU-30) has a fine grid embedded
in the surface that provides excellent protection as well as a non slip
surface durable enough to work on without damage.
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Converting Covered Porch |
For
safety and efficiency, the siding on the second floor walls needed to be
installed before the lower level roofing was reinstalled. The existing
siding was cedar shingles but the birds, especially wood peckers and
flickers, had been having fun destroying portions of it for years.
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'Tasty Meal' |
After considering
many options we settled on replacing existing shingles with a hybrid
product based on high quality natural cedar shingles pre-installed on a
plywood backing 8 feet long and 7 5/8 inch tall allowing a 7 inch finish
cover. Though much more expensive than regular shingles the savings in
installation time and the unique construction of the panel itself made
the decision easy enough.
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Cedar Shingle Panel |
In a standard shingle
installation the layering of one course of shingles over the next leaves
a small gap between adjoining shingles. This gap creates a protected
pocket, hidden from view, but accessible to over-wintering insects.
Birds can sense this available food source and are more than happy to
remove any wood separating them from a very tasty meal. The construction
and installation of these shingle panels eliminates this hidden food
storage pocket. I would be surprised if the developers of this labor
saving product had bird damage in mind but we are happy to take
advantage of this reality. Smarter than the wood. And very nice to look
at as well.
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Finished End Wall |