Drilling Silent Floor Joists

Drill holes with a diameter of no more than one third the depth of the joist staying 2 in.

Drilling silent floor joists.

Joist and the sheathing a common source of squeaks. Jay having used silent floor joists for several years i m well aware of their advantages and limitations. Often hole size can be increased and holes can be placed closer to bearing than shown on the chart based on actual design spans and loads. Let s review what is wrong with this particular joist and discuss what the proper technique is for.

There are very specific locations and sizes in the code telling you what is allowed. 9 16 tji joists design properties 6 floor span and load tables 7 8 tips for preventing floor noise 8 allowable holes 9 cantilevers 10 11 roof span and load tables 12 13 framing. Of walls and rim joists. Drilling floor joists to run plumbing wiring or ducts can be tricky.

Fire safe construction 3 floor performance and tj pro rating 4 5 section 1. Aug 26 2011 03 01 am. However a totally squeak free floor is dependent upon other components of the floor system as well this guide addresses the. Holes anywhere in the web area of engineered i joists except within 6 in.

Ilevel trus joist tji joist specifier s guide tj 4001 march 2007 11 how to use these tables 1. Trus joist tji joist specifier s guide tj 4000 july 2019. Where and how to drill joists for electrical cables or. Using table a table b or both if required determine the hole shape size and select the tji joist and depth.

Scan horizontally until you intersect the cor rect hole size. The picture above shows what can happen when an untrained plumber is working on your home. A properly installed silent floor system will ensure a squeak free floor due to the dimen sional and structural uniformity of the tji joists.