What is the minimum height (maximum cut) of the riser?

FAQs

What is the minimum height (maximum cut) of the riser?

What is the minimum height (maximum cut) of the riser?

The lips for the 9” and 12” catch basins and risers are 1-1/8”. The base of the risers should not be cut shorter than 1-1/8”. Cutting the risers to this length will add 1-1/8” to the top of the catch basins. The support ribs for the 12” riser will need to be shaved to fit into the 12” catch basin. The 18” and 24” risers cannot be cut to shorter heights.