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Do
I have to install the wood perpendicular to the joists?
Oh, my yes. Unless your subfloor is thicker than 1½" AND of
solid wood or plywood, hardwood strip must be laid at right angles to the
joists. (Exception: Over diagonal, solid subfloor boards, install
perpendicular to joists OR subfloor direction.)What
tools will I need to install a hardwood strip floor?
Most, but not all installation tasks can be accomplished with hand tools.
Here is a list of what you might need, noting where it is worth upgrading
to a power tool to save time and aggravation:
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POWER
TOOL
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HAND
TOOL EQUIVALENT
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Pneumatic
stapler, compressor and mallet
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Manual
nailer and mallet (not recommended - very difficult to snug boards
tight together without pneumatic assistance)
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Finish
nailer and compressor (makes top-nailing your starter course much
easier)
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Drill,
hammer and nail set (slower, but less expensive than buying a finish
nailer)
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Power
jamb saw (for undercutting doorway trim)
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Flexible
blade pull saw and a chisel
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Miter chop saw (for cutting boards to length)
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Miter
box and hand saw
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Table
saw or jig saw (for cutting right-angled notches for fitting flooring
around corners)
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No hand
tool equivalent
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No power
equivalent
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Power
jack (for snugging tight final boards that cannot be nailed with
pneumatic stapler)
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Are
you sure I need a pneumatic-assisted stapler?
Yes. Getting boards to snug tight together, especially long boards that
are slightly out of true, is much harder without that pneumatic boost.
Your rotator cuff with thank you.
What
is the deal with underlayment paper - do I really need it?
According to the National
Wood Flooring Association, if you have a wooden subfloor,
you do. The job of this paper is to act as a vapor
retarder. A vapor retarder will slow down the movement
of wet air to your floor. Floors are designed to
handle changes in humidity, but when it happens too fast,
the boards can swell underneath, which leads to crowning on
top. Red rosin paper has long been the traditional
underlayment, but it is no longer considered acceptable!
Acceptable vapor retarders over wood subfloors include:
1. An asphalt laminated paper
meeting UU-B-790a, Grade B, Type I, Style 1a.
2. Asphalt-saturated kraft paper or #15 or #30 felt that
meets ASTM Standard D-4869 or UU-B-790, Grade D.
Unfortunately, both
alternatives are twice as expensive as red rosin paper.
You never want to use plastic sheeting
as an underlayment because that will cause
moisture vapor to condense on its underside, which will lead
to mold and rot in your subfloor and joists.
How long should the wood sit and acclimate
in my house before I install it? Do I really have to do this?
Yes, you really have to do this!
Acclimation is the act of allowing wood moisture content to become at
equilibrium with the environment in which it will perform. So,
acclimation is not measured in time, but in moisture. Your hardwood
flooring needs to be in the room where it will be installed long enough
that a moisture meter reading of the new wood is within 2 percentage
points of the moisture meter reading of existing wood (primarily the subfloor) in the house. This means that you not must have wood
delivered to a jobsite before it is fully enclosed or before temperature
and humidity conditions have reached the level they will be kept at when
the space is lived in. If you rush this step, and your installed floor
either dries or absorbs moisture faster than the wood it is nailed to,
it will exert force against its fasteners causing extreme gapping,
lifted boards and squeaking. "How will I know when my wood
moisture in in equilibrium with its surroundings?" I hear you ask.
You measure it with a moisture meter. We rent them. They are
very easy to use and they will tell you exactly when that wood is ready.
What kind of nails should I use for top
nailing?
2-2½"
7-penny finish nails.
How
do I know where to start?
In general, it is best to choose a starting wall according to the most
aesthetically or architecturally important elements in the room, taking
into consideration fireplaces, doors, cabinets, transitions, and stairs.
If you are only worried about keeping things true, start on an exterior wall because it
is more likely than other walls to be square. The starting wall will
often be the longest unbroken wall in the room. It is worth bringing
your floor plan into our storefront to discuss the pros and cons of the
various starting point possibilities of your space - we love doing this.
Why do I need to leave an expansion gap? It would be
so much easier to start right up against my drywall.
As a general rule, when
installing solid ¾" hardwood, a ¾" expansion space must be
left around the perimeter and all vertical obstructions.
Yes, it's a pain. Because of that that gap, your starting
course of boards must be artificially braced with
screwed-down backer board or spacers. But the
consequences of eliminating that expansion gap can be dire.
Remember, wood is hyrgoscopic; it wants to absorb moisture
from the air. When wood absorbs moisture, it swells
and the swelling produces enormous force. If your
flooring is laid tight up against your studs or drywall and
the humidity of the home increases, the floor has no place
to expand and so the pressure will force the flooring up off
the floor. The moisture caused by a wet basement is
enough to significantly swell and buckle the hardwood floor
above it, so ignore the expansion gap rule at your own
peril.
How
do I snug the last few rows together when I can't use the nailer?
The
accessory pictured at left is a fabulous tool called a Powerjack.
It is a simple, ratcheted jack that is braced against a stationary object
while the lip end is hood over the groove side of your flooring.
Just work the lever and those last crooked boards are drawn tight together.
Check out the Equipment page for pricing information.rentalequip.html
Is
one species of wood better than another? Is there a difference between
different grades of wood?
Different species of wood have properties that make them better suited
to certain conditions (or customers!) but there is no 'best' wood.
Many people equate hardness with high quality, but harder woods are
simply harder to dent. If you are planning to routinely drop
canned goods on your floor, or dance in stiletto heels, hardness is an
important quality. But when it comes to the damage caused by wet,
gritty boots or unprotected chair legs, a really hard floor is only as
hard as its finish. Coniferous woods (fir or pine) are significantly
softer than most hardwoods and deep dents and dings will appear quickly
in floors made of those materials. Still, even those dents do not seriously
affect the performance of the floor, and some people consider such marks
a form of character or patina. Cherry is one of the softest American
Hardwoods, but it is much sought after for its beautiful color. Oak is
an inexpensive wood that some consider common, but it is particularly
easy to cut and sand and it can be pigmented more readily than most
other species. Other qualities to take into consideration are the
dimensional stability of the species (how much it swells when it's
humid), cost, availability, and appearance. Despite the popularity
and apparent green qualities of many imported, exotic species like
bamboo or Brazilian Cherry, flooring tends to behave best when the tree
it came from grew in a climate similar to that of the final floor
location.
The grading of hardwood follows national
standards that are monitored by the National Oak Manufacturer's
Association. They explain it like this: "Appearance alone determines
the grades of hardwood flooring since all grades are equally strong and
serviceable in any application". The higher the grade, the higher
the cost, the more uniform the appearance of the boards and the higher
the proportion of long boards in any given set of flooring. The one grading
category that can make a difference to the performance of your floor is
"quarter-sawn" or "quartered". Wood of any species
that is quartersawn is much more dimensionally stable through changes in
humidity and is much less prone to gapping and cracking over time.
Minnesota has one of the country's largest annual ranges of humidity
change so dimensionally stable lumber makes an especially good
investment in this state.
Is
my subfloor the right composition and thickness to hold strip flooring?
What if it isn't?
The ideal substrate for regular ¾" strip flooring is a minimum
of ¾" of plywood or solid dimensional lumber (most homes built prior to
1965 will have an adequate subfloor because they were built with the
assumption that solid strip hardwood would be installed). The next best
subfloor option is is ¾"
of OSB (Oriented Strand Board). If you have OSB that is thinner than ¾"
or if you have MDF or particle board of any thickness, then you have a
problem. Those substrates are apt to crumble over time - it would
be like nailing your hardwood floor to big piece of shortbread. Inadequate subfloors can be torn out and replaced or,
a new subfloor can be installed directly over the existing one.
I just
finished installing hardwood in my kitchen, but I don't want
to finish it until after the cabinets have been installed.
Can I just put some red rosin paper down to protect the
floor?
Don't do it! Yes, protect
the floor, but don't used red rosin. It is too thin to
protect the wood from wet feet and dropped hammers but, even
worse, if something heavy is dragged across the paper and
rips it, the red pigment from the paper gets driven into the
wood. We've even had instances where the red from the
paper has been driven into the top layer of a new finish.
The safest combo would be sheets or dropcloths, covered with
thin fiberboard, or at least cardboard.
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