The Sealant Made for Log Structures

Water-based caulk for log home repair and sealing

Log Builder® Sealant

Log Builder® Sealant benefits include:

  • Ultra flexible and elastic – won’t crack or pull away
  • Tested and trusted by you – go-to product for log home manufacturers throughout the US
  • Water-based for easy application and clean-up
  • Freeze-thaw stable – OK to leave in your truck overnight

Log Builder® Sealant is excellent for interior and exterior use on:

  • Logs, including checks, cracks, and as a stacking sealant between courses
  • Wood siding
  • Wood trim

Learn how to use Log Builder® Sealant on your log home:

Download Informational PDFs:

Log Builder Sealant options:

Available Sizes: 10.5 oz. cartridges, 29 oz. cartridges, 5 gal. pails

Available Colors: Dark Brown, Tan, Woodtone

Watch how to seal checks and cracks in a log home to keep weather and bugs out.

Product Overview

Log Builder sealant is specifically formulated to absorb most log movement.

In the 1970s, log home owners everywhere were discovering that logs are in constant dynamic motion. They came to Sashco for help, and a few years later, Log Builder® sealant was born. It’s the sealant specifically formulated to absorb most log movement. For over 20 years, Log Builder® has been the trusted sealant included in many manufacturer’s log home kits and packages. Its superior elasticity creates a tight seal that keeps out water, dust, bugs, and wind.


Online Review

I’ve used other caulk but this stuff is the best. I’m in my oak log house 23 years now and the sections between the logs where I didn’t use Log Builder all need to be done again. The other caulks dry out and get hard. The Sashco Log Builder sealant flows and sticks perfectly year after year.