［装修：如何装木地板］准备工作（plywood subfloor, video）

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PREP A PLYWOOD SUBFLOOR FOR HARDWOOD OR LAMINATE

Hardwood and laminate flooring add warmth and beauty to any room, and they’re also a great way to increase the value of your home. Remember that a good flooring installation starts with a correctly prepared subfloor. This pieces shows you how to level your floor, check for excess moisture and mark a starting guideline.

MATERIALS AND TOOLS
* Sander
* Long Level
* Tape Measure
* Shop Vac
* Cementitious Leveling Compound
* Underlayment and Moisture/Vapor Barrier—as required by the manufacturer
* Staple Gun
* Back Saw
* Circular Saw
* Drill with Driver Bits
* Screws
* Hammer or Pneumatic Nailer
* Pry Bar
* Ring Shank Nails or Screws
* Pencil
* Moisture Test Kit
* Utility Knife
* Chalk Line and Chalk
* Safety Glasses
* Work Gloves
* Dust Mask
* Knee Pads

GETTING STARTED

01 Determine how much flooring and materials will be needed.
* Multiply length x width of the room.
* Add about 10% to that number to account for any possible mistakes and warped boards.

02 Remove any carpet or other flooring.
* If you have a vinyl floor, you may be able to install your flooring directly on top of it.
* Check the manufacturer’s instructions for additional assistance.

03 Remove all baseboards to create the appropriate gap at the floor edges for expansion, as recommended by the manufacturer.

04 Check clearance at the doorways.
* If a floor plank and underlayment, or adhesive, will not fit under the door casing, cut the casing with a backsaw about 1/16” above the level of the new flooring.
* If a floor plank and underlayment, or adhesive, will not fit under the door, remove the door and trim it with a circular
saw about 1/8" above the level of the new flooring.
* TIP: If you need to cut the door, get the approximate layout of the cut, and use masking tape on top and bottom
of the cut line to reduce splintering as the cut is made. Measure and mark on top of the masking tape.

SUBFLOOR REQUIREMENTS:
Clean, Level, Dry and Structurally Sound

01 Clean
1. For a glue-down flooring application, the subfloor must be free of wax, paint, oil, sealers, adhesives or other debris.
- Use a sander to remove any coating or sealant.
- Vacuum the floor thoroughly.
2. For nail down, locking or floating installations, you can leave any coating as is, as long as the subfloor is free of dirt and dust.

02 Level
1. Make sure your floor is level.
- Use a long level and tape measure to check that the floor is level.
- Typically, the floor must be level and uniform within 3/16” every 10’.
- Check your wood flooring manufacturer’s recommendations.
2. Sand down high spots with the sander.
- If the high spots are large or there are a lot of them, you might want to rent a random orbital floor sander.
3. Fill in low spots with cementitious leveling compound.
- If you are using nails or staples to secure your flooring, do not use the leveling compound—it will crack. Follow the flooring manufacturer’s instructions.

03 Dry
1. Check the moisture with a moisture test kit.
- Follow the test kit manufacturer’s instructions.
- If moisture levels are not within the wood flooring manufacturer’s recommendations, stop immediately and call a Lowe’s associate for help.
2. If you have a subfloor that consists of wood on top of concrete, you’ll need to test both floors.

04 Structurally Sound
1. Check for structural integrity.
- The subfloor must safely support the flooring, furniture, and people in the room.
- If you’re not sure about the integrity of your concrete subfloor, call an expert/contractor to help out.
2. If a wood subfloor has any loose or squeaky boards, screw them to the floor joists (or nail using ring shank nails).
3. Check wood subfloor thickness.
- Check the manufacturer’s requirements about wood subfloor thickness and width, typically the preferred thickness is ¾”.
- Contact a Lowe’s associate if your wood subfloor doesn’t meet the manufacturer’s requirements.
4. Locking, engineered and laminate flooring may be installed directly over vinyl or linoleum, as long as the floor is no more than two layers thick.

INSTALLING THE UNDERLAYMENT

01 Cover the subfloor with the appropriate underlayment for your type of flooring.
* Depending on the type of floor you install, your underlayment may require a moisture barrier (locking hardwood floors require a moisture barrier like 2-in-1 underlayment).
* Some products have the underlayment pre-attached, but you may also need a separate moisture barrier.
02 Install the underlayment according to the manufacturer’s recommendations.
* Typically, you roll out the underlayment in strips, joining the edges of each row. Leave the underlayment long at the ends; cut it after you’ve installed the floor.

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ACCLIMATING TO THE ROOM

01 Bring the flooring into the room so the wood planks can acclimate to the room’s temperature and humidity for at least 72 hours before installation. This reduces problems associated with moisture, such as warping and fit. Stack the flooring in a flat position in the room or rooms where it is to be installed and allow it to acclimate.

ESTABLISHING A GUIDELINE

01 For a wood subfloor, install the planks perpendicular to the floor joists.
* If you choose not to install the planks perpendicular to the floor joists, you will have to reinforce the subfloor to prevent sagging.
02 Measure and mark the center of all four walls at floor level.
03 Snap the chalk line overtop the plywood or underlayment between the marks on opposite walls making a cross in the center of the room.
04 Determine your starting wall.
* You will lay the flooring lengthwise to this wall.
* When possible, always begin layout or installation from the straightest wall, generally an outside wall.
05 Measure from the center cross to the starting wall, subtract the manufacturer’s expansion gap, and mark on the plywood or underlayment by the starting wall.
06 Using the center line parallel to the starting wall, measure and mark the same distance on each end of the starting wall.
* If your walls are not square and this distance doesn’t allow for the manufacturer’s required expansion gap, re-measure this point per the previous step and use this distance to mark the center and opposite corner measurements along the starting wall.
07 Snap a line between the marks on the starting wall to form a guideline alongthe starting wall.
08 You will lay the flooring lengthwise along this line.

You are now ready to install laminate or hardwood flooring in your room or home.

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Watching the accompany video while reading the materials really helps!

http://www.youtube.com/embed/z4a985yCNuw

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