Continued from page 1
Taping and Mudding
Again start with
ceiling. Apply a skim coat of joint compound over
surface of a seam using a 6” wide taping knife. If
seam is wide, apply a liberal amount of joint compound to fill it. While
Joint compound is still wet, apply
fiberglass tape over
skim coat of Joint Compound. Make sure
seam is centered under
tape. Once
tape has been installed, apply additional Joint Compound over
tape, again using
6” wide taping knife. Continue this for all of
seams. Note:
tape will still be visible. Additional coats will eventually hide it.
The inside corners are usually
most tricky and require practice. Patience is
best advice and note that additional coats will be applied later to smooth out any imperfections. Once
seams are done, using
6” wide taping knife, apply mud to all of
screw/nail dimples. A skim coat is all that is initially required.
Note: When applying
mud over
tape and screw/nail dimples, make sure all excess material and uneven patches are smoothed down with
blade. This will reduce sanding later. Once
ceiling is done, you can move on to
walls. Repeat
same process, however with
outside corners just apply a liberal coat of joint compound to
valley that is formed by
corner bead. This valley typically represents
first 3 or 4 inches from
edge of
corner.
Once
first coat has been applied let it sit overnight or until it is dry, prior to starting
second application of Joint compound. Make sure to completely clean off
taping knife,
mud easel and any other containers or instruments that have mud on them prior to finishing up for
day.
Applying
Second Coat of Mud
After
first coat has thoroughly dried, it is now time to apply
second coat of mud. It is this coat that should hide
tape. Again, start with
ceiling. Using
wider taping knife apply a generous amount of joint compound over
taped seams as you want to build up
area over
tape. Taking large strokes smooth
joint compound over
tape applying more pressure to
side of
taping knife further away from
tape. This will help to leave more mud over
tape. When complete,
mud should cover an area that extends beyond
width of
tape by 2 to 3 inches.
After
seams have all been completed, apply a second coat of mud over
screw/nail dimples. With this second coat, flare out
mud over
dimples such that
diameter of
mudded area is about 3-4 inches in diameter.
For
inside corners a Corner knife may come in handy. Corners involve a little artistry so again take your time. Apply a generous amount of joint compound and then run
Corner knife down
corner starting from
top. Take long, even strokes. A 6” taping knife may also be helpful to smooth out any imperfections. For
outside corners, using
broad taping knife apply a generous amount of joint compound and flare out
material such that it extends out 6 inches or so from
corner. Again, apply more pressure to
blade side that is further away from
corner so that you leave more mud nearer
outside corner.
Once
second coat has been applied let it sit overnight or until it is dry, prior to starting
final application of Joint compound. Make sure to completely clean off
taping knife,
mud easel and any other containers or instruments that have mud on them prior to finishing up for
day.
Applying
Final Coat of Mud
After
first coat has thoroughly dried, it is now time to apply
final coat of mud. It is this coat that requires
most artistry and
least amount of joint compound. Here you are simply applying a final skim coat to
already mudded areas.
Prior to applying
skim coat it is best to take your wide taping blade and lightly pass over
mudded surfaces. This will remove any bumps or ridges.
Again start with
ceiling seams and apply a small amount of joint compound using
broad taping knife. Again continue to flare out
seam by extending
mudded area such that about 6 inches resides on each side of
now invisible tape. Remember this is a skim coat so little mud is required. The purpose of this coat is to effectively fill in any lines or recessed areas.
After
seams have all been completed, apply a final coat of mud over
screw/nail dimples. With this second coat, flare out
mud over
dimples such that
diameter of
mudded area is about 6-8 inches in diameter. For
corners use
broad taping knife and add just enough mud such that you can flare out
mudded surface area to about 8-12 inches, taking care to filling in any lines or dimples. Once
final coat has been applied let it rest overnight or until it is dry,
Sanding
Sanding is a very dusty and dirty mess so please uses goggles and a mask.
I find it best to use a pole sander with an open screened sand paper material specifically designed for sanding sheetrock/drywall mud. Lightly sand all of
taped areas, however concentrate sanding on
outer edges of
mudded areas such that all seams and ridges are eliminated and blend into
main surface areas.
Once sanding is complete, vacuum up
dust and you are ready for priming and painting
walls and texturing
ceilings.

Me_Donovan@comcast.net http://www.homeadditionplus.com http://www.homeaddition.blogspot.com
Over the past 20+ years Mr. Donovan has been involved with building homes and additions to homes. Mr. Donovan's formal education and profession have been as an Electrical Engineer and Marketing Manager.