The Difference is Seamlessly Clear

Extra long, extra thick Monogram® XL have the same great benefits as traditional Monogram, plus they reduce seams. With traditional 12' siding panels, seams appear every two to three feet. Monogram's longer length panels can significantly reduce seams. On a wall that's 25' wide, there are approximately 57 laps with a 12' panel, with 16'panel, 40 laps (35% fewer), with Monogram 46L in 20' length, 26 laps, with Monogram 46XL, 0 Laps!

Two Classic Styles:
Double 4" Rough Cedar Clapboard, 16'8" or 20' or 25'
Double 5" Rough Cedar Dutchlap 16' (not available in Charcoal Gray, Pacific Blue or Sable Brown)

Monogram XL Features:

  • TrueTexture™ rough cedar finish molded from real cedar boards
  • Patented STUDfinder™ is designed for accurate and secure installation
  • RigidForm™ 220 Technology has been tested to withstand wind load pressures up to 220 mph
  • CertiLock™ self-aligning, post-formed positive lock
  • Virtually maintenance free, never needs painting
  • 3/4" panel projection Heavy-duty
  • .046" thickness
  • Class 1(A) fire rating
  • Lifetime limited warranty
  • 32 low-gloss solid colors
  • 7 low-gloss wood-tone blends

Works with traditional length Monogram siding.  

Learn how Cedar Impressions® and Monogram® XL are used creatively on the 2013 Home Makeover project to turn the drab exterior into a dream cottage. InvisiVent Soffit and Vinyl Carpentry accessories add to the dramatic transformation.

Technical Information

Whether you need to obtain product dimensions for calculating the amount of siding you need for a job or find specific code numbers to verify compliance with local building codes, you will find it here.


Proper installation is critical.

These instructions describe and illustrate the steps involved in installing CertainTeed siding, trim, and accessories. Their purpose is to provide detailed information and how-to tips that will simplify the installation process. CertainTeed shall not accept any liability or responsibility under its written warranty for failure caused by application that does not meet the requirements for proper installation. CertainTeed has put together a full installation manual both in English and Spanish. Product specific installation guidelines are provided where applicable for speciality products.

Warranty Details

You can feel confident that you have made the right decision buying from CertainTeed, a company that is an industry leader and stands behind its products with strong warranty protection. The vinyl siding Lifetime Limited Warranty will provide you with specific coverage information.

Sustainability Information

CertainTeed respects the environment through the responsible development of sustainable vinyl and polymer siding products and systems.

Siding Contractors

See All Contractors near You
Get Started