Reinforcing Roof Joists For Mep Units

A higher pitched roof would be better for extra living space than a lower pitched roof.

Reinforcing roof joists for mep units.

A great deal depends on the pitch of the roof. Part 2 of this series will discuss and demonstrate methods to modify open web steel joists and joist girders to increase the load carrying capacity or repair damage. For a 10 span. The first step to reinforcing the roof is to add an x to the frame.

Lift up the new roof joist and press it into the construction adhesive on the broken piece. For example last month we visited an existing tilt up concrete building with steel bar roof joists for blue spruce design and construction. Use 3 inch 16d nails and secure the 2 joists together. Per square foot for dead load framing and roofing and about 25 lbs.

The other is just used to support the trusses. Use 16 d common nails and make sure the tops of the joists are flush. Space them four inches apart along the edges and six inches apart in the middle of the plywood sheathing. A 2x6 roof joist old size sawn framing can support about 40 lbs.

This is where a high pitched roof is necessary. Tensile forces the type of repair procedure may vary. Once again a 2 by 4 inch piece of lumber is placed between the trusses and parallel to the ceiling joists. Open web steel joists and joist girders for revised loading conditions.

This webinar parallels the steel joist institute publication technical digest no. Evaluation of joists and their typical reinforcement in. Per square foot at 24 o c. If you don t have an a frame roof you can run parallel boards between the studs to further offer support and to strengthen the frame.

Use wood adhesive underneath the sheathing along the connecting joint with the roof trusses. Per square foot for live load. Direct nail the first header in to the cut joist and through the trimmer joists in to the header. It is usually best to locate a new unit away from existing units and near an existing bearing wall or girder limiting the amount of new load on the existing joists.

This alone will not hold the joist in place so you will need to nail them together. Simply take 2 diagonal pieces and place them between the trusses. Add the second header and direct nail this header through the trimmer joists. Half the 23 minus 18 for the roof tie depending on local codes and snow load requirements that would allow for about 15 lbs.

The most common design change in the field is due to concentrated loads such as hvac units. Nail the double headers to each other three 16 d common nails every foot. Therefore it is imperative that the building owner or general contractor notify the joist.