Installation Instructions
Allura Fiber Cement Siding Installaon Manual
71
Secon 15: Finishing
Caulking
Use a high quality, exterior-grade caulk or sealant. For 4/4 and 5/4 trim, use caulk that
complies with either ASTM C834 (latex) or ASTM C920 (urethane). The caulk or sealant
should be color matched or paintable. It should be compatible with both Allura Fiber
Cement Siding and the materials used for the trim. Check the gloss and texture of the
caulk to make sure it is compatible with the paint.
To e n s u re t h a t c a u l k s a n d s e a l a nt s s t a y i n p l a c e , w e r e c o m me n d u s i n g m a t e r i a l s t h at
remain flexible. The labels of these materials will be clearly marked with a phrase similar
to “permanently flexible.”
Before you begin to caulk, remove any dust or debris.
Caulk wherever siding meets the trim, at non-self-flashing penetrations, and around
all windows and doors. Do not caulk areas where Allura Fiber Cement Siding has been
inserted into J-channel or another pocket or accessory.
Caulk between Siding and Trim
eae a ga beteen te siding and te trim
Caulk at all end joints around windows, doors, and the corners of the house.
Caulk around exterior penetrations such as dryer vents, exterior lighting fixtures,
pipes, electrical and cable openings, and water spigots.
Do not caulk the bottom of the horizontal joints above the Z-flashing.
Before inserting field-cut edges into a pocket or accessory, prime or paint the edge.
Do not caulk.
Caulk edge joints at upper frieze boards and band boards.
Always follow the caulk manufacturer’s directions.
Do not caulk Allura Fiber Cement Siding butt joints/edges.