Preparing and Painting Your Home's Exterior
Planning and Preparation is the key to making your job easier and professional. Don't make the mistake of buying the cheapest paint you can find and hopping on the ladder the same day you've made the decision.
Amount of Paint Needed
Your
estimate of paint needed will be partially influenced
by the surface type and condition as well as the size.
Rough materials like masonry, brick, rough sawn siding,
and abraided plywood have much more surface area than
smooth siding materials and require about 20% more paint.
For convenience and to better assure color matching, it's
a good idea to purchase all the paint at one time.
1. Measure distance around house and multiply by the average
height. (sides normally higher than front or back.)
2. Deduct square footage of chimneys, windows, doors,
etc. that you won't paint.
This figure will give the approximate square footage.
Divide by the coverage estimate on the paint can label.
Equipment & Tools
Since
this is an outside project, you will not normally need
as much protective breathing equipment or be as concerned
about ventilation as for interior painting projects. However, splash goggles, gloves and appropriate clothing
covering are highly recommended. A dust/mist respirator
mask ( may also be a good idea, especially
if dust and/or pollen is a regular problem for you.
BRUSHES. You will need at least one or two brushes.
Buy best available and keep them clean.
ROLLERS. Three parts: Handle, roller cover, and
tray. Handle can be screwed onto an extension pole up
to elaborate telescoping lengths to increase your reach.
PAINT PADS. Surface of stiff, woven material that
acts like bristles of a brush. Have few uses in exterior
work because they don't hold much, but will work well
on flat surfaces and can be used for siding that's in
good condition or for new shingles.
ROUGH SURFACE PAINTING. Used for painting split
shingles. Looks like a rectangular scrub brush.
SHINGLE BRUSH. Wide, thick, long bristles tapering
to a fine edge, used for painting shingles.
SPRAYERS. Can use for paint or stain. Coating is
put under pressure and forced through a small aperture
that atomizes it into a cloud of droplets. In airless
sprayers, diaphragm pumps and hand-held sprayers only
the paint is under pressure; these are the most commonly
used in house painting.
LADDERS. Make sure any ladder used is in good condition.
Wooden ladders will more easily show their wear than aluminum.
Throw the ladder away if you see cracks or loose joints.
It's virtually impossible to spot fatigued metal in the
aluminum so be sure to buy a good one and then take good
care of it. Ladder care includes not dropping them, not
letting them fall, and not using them for planks. It's
preferable to carry ladders upright, keeping vertical.
For safety, do not stand on top rung while working.
STEPLADDERS. Same criteria as regular ladders as
well as checking out all moving parts, making sure they
work smoothly. Lengths from three to eight feet. Will
have a shelf for your paint bucket. They do not need to
touch the wall, but will be stable if on level ground.
For safety, do not stand on top rung while working.
EXTENSION LADDERS. Available in a large variety
of lengths and how much weight they will hold. Federally
rated.
LADDER JACKS. A ladder jack could be compared to
an adjustable shelf bracket. They hold up planks between
a pair of extension ladders and work as scaffolding. It's
easy to set up and move if there is more than one person.
If you have a lot of scraping and grinding, using ladder
jacks will be very helpful. Use aluminum planks at least
sixteen feet long.
DROP CLOTH. Protect what you don't want paint to
fall on. If you're using a sprayer, cover a much larger
area because the wind can carry the droplets. Drop cloths
made of canvas are thick enough to absorb almost all paint
spills and are heavier and stronger than plastic sheeting
that can be slippery and easily torn.
MASKING TAPE. Protect window glass and other smaller,
finer areas that you don't want paint on. You can mask
less with brushing or rolling paint, but spraying will
require extensive masking. Rollers will require more than
just brushing because there is a small amount of spray
created with rollers. Use tape or paper masking. More
expensive, newer tapes will pull cleaner without leaving
residue. Duct tape works best for masonry. If you have
many windows or many items that will need masking, or
will be spraying, you may want to consider a masking machine
that automatically attaches the tape to one edge of a
strip, pulled from a roll.
SCRAPERS. Remove loose paint. Three kinds: Push,
Pull, and Molding. Be careful not to gouge wood by working
with the grain rather than against or across it. Scraping
is hard work, especially hard on your lower back muscles,
so go easy.
CAULKING GUN. Use caulk to fill gaps between building
materials, like between brick and board siding, wood and
masonry, wood and metal, and plastic and metal as well
as the joints between two pieces of wood like window frames
and door frames. There's several types of caulk for specific
jobs. A "gun" makes it easier by holding the
caulking material container in a more stable and easily
dispensed applicator. There are other tools and equipment
that you may need for your exterior painting project.
Be sure to ask your Sutherlands paint advisor.
The performance of any paint or coating system is directly related to the quality and thoroughness of the surface preparation before painting. This is more important in exterior work than interior work. Before selecting your covering (e.g., paint, stain) choice for any exposure condition, always determine the amount and the type of surface preparation needed.
All surfaces should always be thoroughly dry and free from dirt, oil, grease, wax, rust, and other contaminants.
Countersink all nails.
Fill all cracks, openings or other surface fissures.
Make structural repairs to keep water from seeping into unpainted edges or other areas of the wood. Seal well.
Moisture Primary cause of failure on wood surfaces. Moisture can get behind the paint film from faulty flashing, improper or inadequate caulking, or porous or cracked paint film on exterior surfaces. Don't paint on damp wood and make sure the walls are adequately vented from the home's interior.
Cleaning Mildew and chalking must be removed and surface must be sterilized before repainting. Products are available for this purpose.
Chalking is loose surface powder. All exterior paints will chalk after long exposure to weather-some more than others. If minimal, it may be able to be sealed to the surface with a clear sealer before repainting.
Sandpapering All glossy areas must be dulled, particularly under the roof eaves, the soffits, and fascia boards.
Application The paint, the surface, and the air temperature should be between fifty degrees and ninety degrees unless the product specifications indicate otherwise. Relative humidity should be below 85%.
Painting early in the day is better than late in the day. Dew or condensation are more likely later in the day.
SPECIFIC
EXTERIOR SURFACES (In addition to General Preparation)
NEW UNPAINTED WOOD & HARDBOARD. Spot prime
nail heads and putty nail holes flush with surface.
Apply recommended primer over entire surface. Sand surface
roughness. Wipe clean. Remove any sap with solvent.
Shellac over knots before priming. Prime coat.
Note: Back-priming of new wood siding prior to its actual
placement on the house is by far the best protection
as a vapor barrier. Be sure edges are also sealed.
REDWOOD OR RED CEDAR. These are prone to bleed-through
staining when coated with latex paint, depositing brown
stains on the surface. These can be washed off with
a mild detergent followed by a thorough clean water
rinse. Dry completely before painting. To prevent the
stain from bleeding through when attempting to cover
with paint (not another stain), is to prime with a special
primer made for this problem.
NEW HARDBOARD SIDING. Surface preparation will
be key to the optimum performance of coating this material.
Wash and rinse thoroughly. If water beads during rinse,
wash again. Rinse again. Dry thoroughly. If mildew is
present, it will need to be treated. Wax in this material
may rise to the surface when exposed to hot sunlight
or high moisture conditions. Seal.
PLYWOOD VENEERS, TEXTURED WOOD. Prone to cracking.
Paint failures are difficult to prevent without using
a stabilizer. Use as a spot primer or over-all on new
wood or repaint surfaces. Water based stains or house
paints are preferred as a top coat.
NEW UNPAINTED BRICK, CONCRETE BLOCK, CINDER BLOCK,
VERTICAL MASONRY. All cracks, openings, surface
fissures must be repaired before painting. Vertical
concrete may already have a surface coating or contain
additives. For good adhesion, this material must be
removed by sandblasting before any coating application.
UNPAINTED POROUS/OPEN FACE CEMENT/CINDER BLOCK.
Fill with a masonry block filler to keep out wind-driven
rain. Topcoat. If unsure, ask any Sutherlands representative,
call any of the Sutherlands Locations or e-mail your
particular situation question or problem . Sutherlands
is always happy to be of help to you in your home project
plans.
LATEX TOP COATINGS. New, dry masonry that is
free of chalk, crumbling, and efflorescence-and is not
highly alkaline-will not require a special primer if
latex paint is used as a finish coat. It serves as its
own primer. If it IS alkaline, you need to prime. If
the new, unprimed surface is porous and you are using
the latex as a primer, reduce the first coat with one
pint of water per gallon.
ALKYD TOP COATINGS. New masonry free of chalk
and efflorescense, but suspect high alkali content,
will need alkali-resistant primer. Product reduction
may be necessary if surface is porous.
REPAINT CONCRETE BLOCK/CINDER BLOCK/ BRICK/ VERTICAL
MASONRY. Repair all breaks or defects, including
those in old paint film. Deep cracks in masonry should
be partially filled with grout, followed by an elastic
caulking compound. Don't overlap onto the surface edges
of the crack because it will eventually dry and curl.
Remove all loose and scaling paint by scraping and sandblasting.
REPAINT ALUMINUM SIDING. If corrosion, remove
with power brush, scraper, or sandpaper. If bare aluminum
is exposed or factory coating cracked or chipped, prime
it.
NEW UNPAINTED ALUMINUM (AND BARE ALUMINUM REPAINT).
Thoroughly clean. Prime.
PAINTED, WEATHERED ALUMINUM SIDING. May be heavily
chalked. Clean. If difficult to completely remove by
washing and rinsing, primer may need to be applied when
dry to obtain proper adhesion. It's important to paint
as soon as possible after cleaning so mildew growth
doesn't begin.
PAINTED, UNWEATHERED ALUMINUM SIDING. Those protected
from weather (e.g. eaves, soffit, porch ceiling, carports,
etc.) must be washed and rinsed clean and then primed.
POSSIBLE PROBLEMS
MOISTURE-RELATED PROBLEM SOLUTIONS
Blistering
& Peeling: Scrape and sand to bare wood. Repaint
only when totally dry. If preventive measures are not
taken, it's sure to return. Water based latex paint recommended.
Mildew:
Scrub thoroughly with mildew remover or with a solution
of household bleach, detergent, and water. Wear rubber
gloves and splash goggles. Repaint when totally dry with
paint with a fungicide added.
Bleeding/Rust-colored Stains: Caused by non-resistant
nails that weren't sealed before painting or have popped
up over time. If they're firmly set, sand down to the
nail head and seal it with pigmented shellac and then
repaint. If the nails are popped ones, remove and replace
with new, slightly larger, rust-resistant ones. Repaint.
MISCELLANEOUS PAINT PROBLEM SOLUTIONS
Running/Sagging/Wrinkling/Droopy/Wavy: Caused by
too thick application. Paint may be too thick or you are
applying too heavily. Check on this as you paint and catch
before paint is dry so you can usually brush out the runs
or sags. Thinning may help if too much is clinging to
the brush. If paint has already dried, you will need to
sand and, this time, lightly repaint.
Checking: Term for long, evenly spaced cracks,
usually horizontal in painted siding. Common in older
homes from natural shrinking and swelling, especially
with layers of older, inflexible paint. Only way to solve
this problem is completely start over...remove, prime,
and repaint.
Alligatoring: Term for rough scales. Caused by
second coat applied over an incompatible paint or over
a wet first coat so no bond was formed. Scrape and sand
to bare wood. Prime. Repaint.
Bleeding Knots: Term for circular shaped discoloration
in stained or painted siding. Resin, dissolved by solvent
in paint, has come to the surface from knots in wood not
properly sealed. Strip and sand to the knots. Apply sealer
or shellac to the knots. Prime. Repaint.
Efflorescence: Term for brick's and mortar's material
of calcium and magnesium sulfates that have dissolved
and come to the surface and become crystallized from heat.
This frosty coating may appear on damp interior or exterior
walls. It must be removed and corrected and the surface
must be treated before repainting.
Chalking: More a feature than a problem, common
to many latex exterior paints. Paint is formulated to
gradually decompose over time so as the binders and resins
wear away, the pigments in the paint are released as a
very fine powder. With each rainfall, some of the powder
will be washed away and take surface dirt with it. It
actually helps to keep exterior paint looking bright,
but it also creates unsightly stains, especially on brick
walls. Lack of rain can result in excessive chalk build
up, but inferior paint is also a cause. Wash with a detergent
solution, rinse with clear water. For new latex, apply
a special chalk-absorbing primer first. For oil base,
two coats will need to be applied.
EXTERIOR COLOR HINTS
Basic guidelines for house paintingTO LOOK LARGER: Paint light color.
TO LOOK TALLER: Paint any vertical trim in contrast color of house body color.
TO LOOK WIDER: Emphasize horizontal lines with contrast color.
TO EMPHASIZE TRIM: Have a high contrast between main house color and the trim. A dark house and light trim create greatest impact.
DE-EMPHASIZE MULTIPLE TEXTURES: All the same color.
BLEND INTO SURROUNDINGS: Don't use colors that contrast with the surroundings.
BLEND HOUSE ACCESSORIES: Paint roof vents to match roof as possible, or other metal house accessories such as gutters the same color as eaves. Color downspouts same color as house.
Take plenty of time to look over and visually picture color options. Doing it in small segments rather than one long stretch of time will be more productive in your choice. Get color ideas from magazines, paint chips, fabrics, and taking photographs of houses you like. Be careful not to chose colors that may be too intense in a wider expanse.