Handling and storage



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HANDLING AND STORAGE

1.  KOMA


®

 trim boards should be stored on a level,  

flat surface.  If stored on an uneven surface for an  

extended period, some waviness in the boards could 

occur. This may cause them to be unsuitable for certain 

applications.

2.  KOMA

®

 trim boards have one of the hardest and most 



durable surfaces in the industry and will withstand  

reasonable handling at the lumber yard and on the job site.  

Care should be taken to avoid unnecessary damage.

3.  KOMA


®

 trim boards are shipped in pallet units   

enclosed in protective shrouds. After clipping unit 

bands, continue to use the protective shrouds. 

4.  Additionally, KOMA

®

 offers boards in individually shrink 



wrapped packs to further protect shipped product. Do 

not remove shrink wrap until ready to install. This will 

help keep the material free of dirt and debris.

CLEANING

1.  All exterior building materials require some degree of 

maintenance and cleaning.  Most stains are caused 

naturally or environmentally and do not constitute a 

manufacturing defect.  Just like wood, KOMA

®

 trim 



boards are not impervious to grease, mud, bird  

droppings, or stains resulting from normal use and 

environmental conditions.

2.  Below are products that are effective for general  

cleaning and will not harm KOMA

®

 trim board’s  



surface.  The stain or contamination will determine the 

appropriate selection.  Always follow the manufacturer’s 

instructions for use and test in an inconspicuous area.

 - Super Clean™

 - Clorox Outdoor Bleach Cleaner™

 - Jomax™

 - Or equal

3.  Denatured alcohol or mineral spirits can be used to 

remove smudges left from handling during installation.

4.  Do not use harsh (aggressive to PVC) solvents such as 

acetone, toluene, MEK, etc.

5.  For exceptionally stubborn or ground-in dirt a cleaning 

solution can be prepared by mixing: 1/3 cup powdered 

detergent (such as Fab™ or Tide™) and 2/3 cup  

powdered household cleaner (Spic™ & Span™,  

Soilax™) in one gallon of water.  Apply the cleaning 

solution with a stiff-bristled brush (nylon, or natural 

fiber) and rinse thoroughly.

6.  If mildew is present, use a solution of 30% vinegar and 

70% water or a mixture of: 1/3 cup of non-ammoniat-

ed powdered detergent, 2/3 cup tri-sodium phosphate 

(TSP, sold in paint stores) and one quart of chlorine 

bleach in one gallon of water.  Apply the solution with 

a stiff-bristled brush and rinse thoroughly.

 

WARNING: NEVER MIX CHLORINE BLEACH WITH  

AMMONIATED CLEANERS.  A DANGEROUS GAS  

IS PRODUCED!

7.  KOMA


®

 trim boards can also be cleaned by sanding.  

See the sanding section for recommendations.

FASTENING

1.  KOMA


®

 trim boards are non-structural decorative trim. 

2.  Nail guns and fasteners intended for typical wood trim 

installations will work with KOMA

®

 trim boards.  



3.  Avoid ring-shanked nails as they cause blow out on 

the back side of installed trim.  

4.  Fasteners should penetrate solid framing substrate  

at least 1 1/4” and be spaced no farther apart than  

16” on center.

 

Figure 1 on the following page demonstrates proper 



fastener penetration into substructure.

KOMA


®

 TRIM BOARD 

INSTALLATION AND 

HANDLING GUIDELINES



5.  If gun nailing, make the necessary adjustments (e.g. air 

pressure, nail gun depth stop) to countersink the head 

of the nail 1/16” to 1/8” below the surface. Test on 

pieces of scrap before applying finished product.

6.  Use non-corrosive fasteners for lasting results. We 

suggest stainless steel or a coated fastener that has 

passed ASTM B117 test criteria.

7.  When hand nailing, avoid striking the board surface 

with excessive force.

8.  Where possible, glue KOMA

®

 trim boards to the  



substrate using construction adhesives identified for 

use with PVC (see Figure 4). Always read the adhesive 

label or check with the manufacturer to confirm that 

the adhesive is appropriate for use with PVC.



9.  Note: Adhesive assists in minimizing installed boards 

thermal movement. Adhesive should never be used as 

a subsitute for proper nailing schedule. 

10.  Use accepted trim installation nailing schedules based 

upon standard residential light frame construction 

layout (16 o.c.).  Wider boards will require additional 

fasteners at each fastening location.

 

Figure 2 specifies the number of fasteners required at each 



attachment location. (16” on center spacing maximum)

 

11.  Provide adequate blocking at all joints. Use butt joints 

to join boards in long runs, e.g., fascia, frieze, rake, or 

band boards. 

12.  Pre-drilling KOMA

®

 trim boards may be necessary 



when using large diameter fasteners or when installing 

in low temperatures.

13.  When applying more than  

 three fasteners to a board  

 in the same stud/blocking  

 location, slightly stagger  

 the line of the fasteners.  

SPANNING

1. 


KOMA

®

 trim boards 



are decorative trim and 

should not be used as 

load bearing elements or 

assemblies for structural 

applications. Never install 

KOMA


®

 trim boards  

 

 

 



 

to a span greater than 16”.

2.  Fasten KOMA

®

 edge & center bead board every 12” 



to 16”.  Always install KOMA

® 

 edge & center bead 



board at right angles to the framing. Fasten KOMA

®

 



bead boards with one fastener per every square foot of 

installed surface area.

3.  When spanning greater than 16”, install blocking and 

bracing. In the case of spanning/covering rafter tails 

with spacing greater than 16” o.c., install a continuous 

sub-fascia onto which the KOMA

®

 trim boards and 



other elements (eg., moldings, decorative brackets, 

etc.) will be fastened.



THERMAL MOVEMENT

1.  KOMA


®

 trim boards are polymer based and  

 

will expand and contract with changes in temperature.



2.  Adequate fastening of KOMA

®

 trim boards will minimize 



the movement that occurs due to changes in tempera-

ture.  Where possible, adhere KOMA

®

 trim boards to the 



substrate/substructure. We suggest using construction 

adhesive on the back of KOMA

®

 trim boards (see  



“Adhesive Chart” Figure 4) in addition to mechanical 

fasteners (“fastening schedule” outlined in fastening). 



BOARD WIDTH

3 1/2”  (1 x 4)

2

3

3

4

4

2

3

3

3

4

2

2

2

2

2

2

2

2

3

3

3

2

3

3

3

3

4

4

4

4

5 1/2”  (1 x 6)

7 1/4”  (1 x 8)

9 1/4”  (1 x 10)

11 1/4”  (1 x 2)

15 GA

(0.072”)

14 GA

(0.080”)

13 GA

(0.0915”)

12 GA

(0.0915”)

7d

Finish

#7 (min.)

Trim Head Screw

Fasteners required at each attachment location. (16” on center spacing maximum)

FIGURE 2


FIGURE 3

FIGURE 1


1-1/4” Penetration

into framing

substrate

SCREW


#7 TRIM HEAD

2-1/2” long

1-1/4” Penetration

into framing

substrate

FINISH NAIL

MINIMUM 15 ga.

2-1/2” long

KOMA

KOMA


SHEATHING

3.  Apply construction adhesive in a stop start diagonal 

line pattern with a bead size of 1/4” – 3/8” diameter 

on to the substrate area the KOMA

®

 trim boards will 



cover.  

4.  Properly bonding joints between pieces of KOMA

®

  

trim boards with a suitable structural adhesive or  



welding cement (see figure 6) will minimize or  

discourage separation and unsightly gaps.

5.  Positioning expansion joints along runs >36’ can  

accommodate movement that occurs due to changes 

in temperature. 

Figure 5 is a cross-section of an expansion/control joint.

 

(

If you have any questions pertaining to these  



situations or applications please call technical  

support at KOMA Building Products (800.330.2239).



Type of Adhesive

Brand

Supplier

Function/Application

Properties/Characteristics

Toughened Acrylics 

PVC Trimwelder

KOMA® Building Products 

(Huntsville, AL.)

800.330.2239

komabuildingproducts.com 

Bonding KOMA to KOMA, excellent for filling fastener holes. 

Color matched to KOMA with UV stabilizer. Standard  

formulation cures in 15-20 minutes; 5 Minute fast-cure 

formula available. Delivered through a mixing nozzle from  

a plural component gun.

Plural component, fast curing, high 

strength, more flexible than epoxies

Construction Adhesive 

PL Polyurethane  Premium 

Construction Adhesive

Henkel Corporation

(Mentor, OH)

800.624.7767

www.stickwithpl.com 

Attaching trim to substructure and sheathing.  

Pl formulation is polyurethane enhanced for superior  

elongation and long-term flexibility. Applied from cartridge 

using standard caulking gun. 

Flexibility, impact resistance, durability 

Solvent/Welding Cement White Hot

KOMA Building Products

(Huntsville, AL) 800.330.2239

komabuildingproducts.com

Welding KOMA to KOMA; dries opaque off-white. Applied 

by brush. Available in numerous size cans (smallest with 

applicator brush). Water clean-up.

Medium body, clear, one-step self  

priming, cleans up with water

Christy’s Super  

Hot White Vinyl

T. Christy Enterprises, Inc.

(Anahiem, CA)

715.507.3300

www.tchristy.com

Welding KOMA to KOMA, UV stabilized, white, excellent gap 

filling and for making repairs.

Single component comprised of resins 

and solvents

Notes: The bonding agents listed above have produced excellent results for each category of application.  Always test prior to use to determine  

suitability and read and follow adhesive manufacturers’ instructions.  We encourage other suppliers to provide test data showing equivalent or  

superior performance and we will include them in next printing, other technical bulletins, and training/educational materials.

FIGURE 4  

ADHESIVE CHART

FIGURE 6


DO NOT JOIN LONG RUNS

WITH SCARF JOINTS

USE ADHESIVE TO

BOND BUTT JOINTS

USE ADHESIVE TO

BOND BUTT JOINTS

1-1/4” FASTENER PENETRATION 

INTO SOLID FRAMING SUBSTRATE

PROVIDE ADEQUATE

BLOCKING AT ALL JOINTS



1/4”

3/8”

FIGURE 5


1. 

DIMENSION A AND B MUST  BE AT LEAST 3/16”

2. 

RATIO OF A:C SHOULD BE 2:1 MINIMUM



3. 

APPLY MASKING/PAINTERS TAPE FLUSH WITH EDGES OF GAP AND 

INSERT BACKER ROD.

4. 


FILL CAVITY WITH SEALANT MATERIAL AND TOOL/SCREED FLUSH WITH 

SURFACE. A SECOND FILL WILL YIELD A MORE LEVEL RESULT.

5. 

DIMENSION B SUGGESTED MAXIMUM = 3/8”



GLUING

1.  To achieve optimum KOMA

®

 to KOMA


®

bonds, the    

mating surfaces should be clean, dry, and free from  

contamination.

2.  We suggest using KOMA

®

 PVC Trimwelder or a first  



quality welding adhesive identified for use with PVC for 

edge-to-edge, edge-to-face, and face-to-face bonding of 

KOMA

®

 to KOMA



®

. Take caution to not over-clamp edge 

to edge bonds. A film layer is necessary for strongest bond. 

3.  Use square cut butt joints to join KOMA

®

 to KOMA


®

 on 


long runs such as fascia, frieze, and rakes.  

4.  Fasten KOMA

®

 trim boards securely on both sides of 



the glued joint to ensure adequate cure time. Fasteners 

should be >1/2” from end or edge of material.

Figure 6 demonstrating correct nail proximity to board to 

board attachments.

 

Do not use acrylic painters caulk or silicone caulk.



 

They will not adhere long term and will contaminate    

gaps and joints when you attempt to correct their lack  

of performance.

NO SCARF JOINTS


SAWING AND CUTTING

1.  KOMA


®

 trim boards can be cut using the same saws 

normally used for cutting wood; e.g., circular, miter,  

radial, table, panel, band, jig, and industrial gang rip.   

It is important that the cutting blades be good quality

clean and sharp.  TCT (tungsten carbide tipped) blades 

with a high alternate top bevel (hiATB) or triple chip  

grind (TCG) yield the best results.  Choose 10” blades 

with 80 teeth or 12” blades with 96 teeth for a smoother 

edge finish.

2.  Maintain a feed/rpm rate that allows for efficient chip 

removal.  Always position the stock so that the teeth 

are cutting into the good or “finished” face.

3.  Use of fine toothed scroll or jigsaw blades is not  

recommended.

4.  Following these general work practices will  

improve results:

– Plastics absorb heat and care must be taken not to 

overheat the work piece. Feed rates are important. Too 

slow a feed rate will result in teeth rubbing rather than 

cutting, creating friction and melting the chips.  Rates 

will vary with material thickness, geometry of cutting 

teeth, and speed of blade rotation (rpm). Always run 

test pieces to determine optimum performance. 

– Plastics are not as stiff as some other materials.  

Adequate support should be provided for the work 

piece. Always secure the stock before cutting.  

When rip cutting, use a rip guide or secure a straight 

edge to use as a cutting guide.

PAINTING

1.  KOMA


®

 trim boards do not require paint for protection 

from the elements (sunlight, rain, insects).  However, 

when painted, PVC trim will rinse cleaner and be less 

prone to attract dirt and stains that are caused  

by environmental conditions.

2.  If painting is desired to achieve a custom color, use a 

100% acrylic latex paint with a LRV (Light Reflective 

Value) of 55 or higher.

3.  No special preparation or priming is required prior to 

painting. The KOMA

®

 trim board’s  surface should be 



clean and dry.

4.  KOMA


®

 trim boards do not absorb moisture. Paints will 

last longer on KOMA

®

 than on wood since moisture 



cycling does not occur.

5.  Always follow the paint manufacturers  

recommendations.

6.  Factory finishing by independent coaters is available in 

some areas.  Call KOMA

®

 technical support for referrals.



NOTE: Compared to PVC trim produced with free foam 

technology, most users will appreciate the immediate 

and long-term adhesion advantage of KOMA

®

’s Celuka  



technology PVC trim products. Simply stated, paints 

commonly cover KOMA

®

 Celuka’s sheet and boards on 



the first coat and are more scuff and scratch resistant.

SANDING

 (Does not apply to KOMA free foam products)

1.  Unlike free foam PVC trim products, KOMA Celuka trim 

can be sanded without marring the surface. KOMA trim 

may be sanded with any type of sander. To maintain 

the proprietary KOMA surface texture, it is recommend-

ed to use a block or belt sander and sand in the direc-

tion of the surface grain. Use 120 grit paper and apply 

light pressure. Practice on a scrap piece of KOMA until 

the desired result is obtained. When it is necessary to 

cut or cope KOMA at the job site for a custom fit, a belt 

or pad sander may be used to smooth the edges.



DRILLING

1.  Holes can be drilled with standard steel twist drills. 

They should be sharp with an included point angle of 

between 100º and 120º, a spiral angle of 30º, and a 

relief angle of 10º.

2.  When drilling, it is important to ensure good chip  

removal to avoid overheating the hole walls and  

causing a build up on the drill.  This can be  

accomplished by drilling with a peck or “woodpecker” 

method, alternately plunging and withdrawing the drill 

to clear chips..

3.  Drills ground for rigid PVC are not necessary  

or recommended.

ROUTING

1.  KOMA


®

 trim boards can be routed as easily as wood 

and with the same equipment and tools. Standard 

carbide tipped router bits with multiple flutes work best 

when using hand-held routers.

2.  Dimensional consistency and uniform thickness of  

KOMA

®

 trim boards enable it to be machined to tighter 



tolerances than wood. This is an advantage when  

milling with CNC equipment or when performing  

repetitive fixture builds.  

For specific tooling recommendations, feeds, and speeds, 

please call technical support at KOMA Building Products  

(800.330.2239)

komabuildingproducts.com

3402 Stanwood Boulevard

Huntsville, AL 35811

1.800.330.2239

A Division of Kommerling USA

TBIHG 0713/10M



Made in the USA

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