Call Now for a Free Estimate! 804-752-0008

Siding Glossary

When choosing siding for your home, make sure you know the following terms and phrases. They will help you make better choices for protecting your home and family.

  • Backer Tab – Provides support for non-insulated 8″ siding at panel overlaps (joints), and behind panels at corners to ensure a smooth installation.
  • Butt Edge – Bottom edge of siding/soffit panel or accessory piece opposite the nailing slots.  Locks onto the preceding panel.
  • Channel – Area of accessory trim or corner post where siding/soffit panels are inserted.  Also refers to trim itself, and named according to letter of alphabet it resembles (i.e., J-channel, F-channel, etc.).
  • Course – Row of panels running the length of the house.
  • Face – Side of siding/soffit panel that is showing once panel has been installed.
  • Face Nailing – Action of fastening directly onto the face of panel, rather than using the nail hem slot.  Generally not used in siding installation.
  • Fascia – Vertical finishing edge usually fastened to ends of rafters or trusses.  Most commonly found where the gutter is attached.
  • Flashing – Thin, flat material – usually aluminum – positioned under or behind J-channels, corner posts, windows, etc., to keep water drainage from penetrating house.
  • Individual Outside Corner Cap – Possible alternative to outside corner post when installing 8″ horizontal siding.  Maintains continuity of siding courses in traditional clapboard style.
  • Inside Corner Post – Provides a means of joining at inside corners where siding butts both sides.  Deeper posts are for insulated siding, and narrower posts for non-insulated siding.
  • Insulated Siding – Available with factory-laminated polystyrene backing.  In addition, separate drop-in backer board is available which can be combined with the siding panels at the time of installation.  Laminated and drop-in backer board thickness vary from 3/8″ to 1/2″, and can be used with 8″, Double 4″ or Double 5″ siding.
  • J-Channel – Used for receiving siding on all sides of windows and doors, at rake edges of gables and in other miscellaneous situations.  Deeper J-channels are for insulated siding, and narrower J-channels for non-insulated siding.
  • Lap – To overlap ends of two siding panels to allow for expansion and contraction of siding product.
  • Lug/Crimp – Raised tabs on siding panel created by a snap-lock punch.  Can be used to lock siding panel into place when the nailing hem has been removed.
  • Mitre Cut – Diagonal cut, beveled to a specific angle (usually 45).  Sometimes applied to an overlapping siding or soffit panel surface for a neater appearance.
  • Nailing Hem (Flange) – Location of nailing slots on siding panel or accessories.
  • Outside Corner Post – Provides neat appearance outside corners for vertical and horizontal sidings.  Receives siding from both sides.  Deeper post is used with insulated siding, and narrower post with non-insulated siding.
  • Snap-Lock Finish Trim – Used to finish off (trim) job-site cuts on siding, as under windows, at eaves, and at porch door locations.  May also be used to receive vertical siding at corners and window jambs.  The snap-lock design allows siding to be notched and locked into place without face nailing.
  • Soffit – Vinyl or aluminum material used on the underside of eaves between the exterior wall and overhanging edge of the roof rafters.
  • Starter Strip – Baseline accessory which secures the first course of siding to the wall.  Used with horizontal and vertical siding.
  • Trim Coil – Painted aluminum and steel material commonly used to case around windows.  Allows remodeler to totally enclose house.
  • Underlayment – Weather-resistant material placed under siding panels.
  • Weep Holes – Openings cut into siding or accessories to allow water runoff.
  • Window Head Flashing – Alternative to J-channel to receive siding over doors and windows and as a base flashing on vertical siding installations.


  • Beaded – Authentic 17th century horizontal Colonial beaded ridge in a 6.5″ design with graceful shadow lines.
  • Clapboard – Classic horizontal design with stepped beveled boards and bold shadow lines.
  • Dutch Lap – Traditional horizontal design with stepped sculpted boards to maximize horizontal shadow lines.
  • Vertical Board & Batten – Vertical siding with deep shadow lines created with raised batten strips.

Get a Free Quote and be Entered to Win a Free Roof!

We Were Totally Pleased

A Plus Roofing recently replaced our roof, and we were very pleased with their professionalism, attention to detail, and the overall quality of the job they did. From the initial quoting process, during which Bill Kain explained how they would do things and the extra things A Plus Roofing would do to make the job look and go well, to the care of the actual workers in protecting everything around our house as they did their work, to the final cleanup of the job, we were totally pleased with our choice in contractors. I plan to use A Plus Roofing for other work on my house in the future (gutters done with roof, siding and window work in the plan), and I will heartily recommend them to all of my friends and neighbors without hesitation. 

– Henrico

Very professional

Very professional. Did exactly what they said they would do. No surprises.

– Hanover

Excellent Experience

The experience with A+ Roofing was excellent. I would recommend this company for their courteous, professional, and efficient service and expertise. We are most pleased with our new roof and the workmanship of the project. The roofing crew was amazing to watch....so hardworking and professional. Mr. Kain was in touch during the whole project and we knew were in good hands. Many thanks! 

- Chesterfield

We Are Very Satisfied

This was our first roofing experience. We checked the company out online and asked the company for references from previous jobs. I talked to two previous customers (1 asphalt roof and 1 metal roof on residential homes) and both couldn't say enough good things about the company, their crews and the quality of their work. We are very satisfied and would definitely recommend them to others.


Would Definitely Recommend!

The team was professional and thorough. The house looks like a completely different house with the beautiful new roof! There was not a speck of debris left in our yard. After the roof was on and the materials were cleaned up, I was impressed to see the workers carefully going around our whole property using giant magnets to pick up any loose nails that may have fallen.  We've had over a foot of snow and several heavy rains and have been very snug under our new roof. Would definitely recommend! 

- Henrico