Reinforcing Roof Joists For Mep Units

This webinar parallels the steel joist institute publication technical digest no.

Reinforcing roof joists for mep units.

Direct nail the first header in to the cut joist and through the trimmer joists in to the header. A 2x6 roof joist old size sawn framing can support about 40 lbs. The other is just used to support the trusses. Open web steel joists and joist girders for revised loading conditions.

Per square foot at 24 o c. Continue reading below our video of the day. Per square foot for live load. This is where a high pitched roof is necessary.

Use 16 d common nails and make sure the tops of the joists are flush. For a 10 span. The most common design change in the field is due to concentrated loads such as hvac units. Space them four inches apart along the edges and six inches apart in the middle of the plywood sheathing.

Lift up the new roof joist and press it into the construction adhesive on the broken piece. This alone will not hold the joist in place so you will need to nail them together. Evaluation of joists and their typical reinforcement in. 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.

A great deal depends on the pitch of the roof. Connect roof sheathing to the roof framing with ten penny weight common or eight penny weight ring shank nails. A higher pitched roof would be better for extra living space than a lower pitched roof. Nail the double headers to each other three 16 d common nails every foot.

Use 3 inch 16d nails and secure the 2 joists together. 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. 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. For example last month we visited an existing tilt up concrete building with steel bar roof joists for blue spruce design and construction.

Simply take 2 diagonal pieces and place them between the trusses. Use wood adhesive underneath the sheathing along the connecting joint with the roof trusses. Per square foot for dead load framing and roofing and about 25 lbs. Therefore it is imperative that the building owner or general contractor notify the joist.

Add the second header and direct nail this header through the trimmer joists. Once again a 2 by 4 inch piece of lumber is placed between the trusses and parallel to the ceiling joists. Tensile forces the type of repair procedure may vary.