How can I search for UL certified Wall-opening Protective Materials that can be used to protect electrical boxes that create a membrane penetration in fire resistance-rated wall Designs?

June 27, 2022

How can I search for UL certified Wall-opening Protective Materials that can be used to protect electrical boxes that create a membrane penetration in fire resistance-rated wall Designs?

May 10, 2021

Can the fastener size specified in a UL fire resistance-rated assembly be increase?

April 8, 2020

If I add an additional layer of gypsum, or increase the thickness, can I achieve a higher fire resistance rating?

April 8, 2020

Can I substitute Fire-retardant-Treated Wood for Gypsum in a UL Design?

January 17, 2020

Can I add structural wood panels like plywood to a wall assembly?

January 17, 2020

Can a larger wood or metal stud be used than what is specified for a specific UL wall assembly?

January 17, 2020

What is an engineering judgment?

January 17, 2020

What modifications can be made to a UL certified assembly?