Privacy policy
Analytics
We use Google Analytics to understand which pages and calculators are useful. It sets cookies and collects anonymous usage data such as pages viewed, device type and approximate location. You can opt out with Google's browser add-on or your browser's tracking settings.
Affiliate links
Amazon may set cookies when you follow a product link so that a qualifying purchase can be credited. Amazon's own privacy notice applies on its site.
If you request a parts list or contact us, we receive the email address and message you send, and use them only to reply or send what you asked for. We do not sell personal information.
Calculators
Calculator inputs are processed in your browser and are not sent to us.
Contact
Questions about this policy: use the contact page.
This page is researched guidance, not professional engineering, legal or building-code advice. Sizes, loads and permit rules vary by product and by town: check your local code and the kit manufacturer's instructions before you build.