Reinforcing Roof Joists For Mep Units

Use 16 d common nails and make sure the tops of the joists are flush.

Reinforcing roof joists for mep units.

The most common design change in the field is due to concentrated loads such as hvac units. Evaluation of joists and their typical reinforcement in. Open web steel joists and joist girders for revised loading conditions. This is where a high pitched roof is necessary.

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. Direct nail the first header in to the cut joist and through the trimmer joists in to the header. For a 10 span.

For example last month we visited an existing tilt up concrete building with steel bar roof joists for blue spruce design and construction. Per square foot for live load. Simply take 2 diagonal pieces and place them between the trusses. A higher pitched roof would be better for extra living space than a lower pitched roof.

Connect roof sheathing to the roof framing with ten penny weight common or eight penny weight ring shank nails. Half the 23 minus 18 for the roof tie depending on local codes and snow load requirements that would allow for about 15 lbs. Use wood adhesive underneath the sheathing along the connecting joint with the roof trusses. This alone will not hold the joist in place so you will need to nail them together.

To reinforce these members the best option. Use 3 inch 16d nails and secure the 2 joists together. Per square foot at 24 o c. Add the second header and direct nail this header through the trimmer joists.

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. 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. Once again a 2 by 4 inch piece of lumber is placed between the trusses and parallel to the ceiling joists. A great deal depends on the pitch of the roof.

This webinar parallels the steel joist institute publication technical digest no. The first step to reinforcing the roof is to add an x to the frame. The other is just used to support the trusses. Lift up the new roof joist and press it into the construction adhesive on the broken piece.

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. Tensile forces the type of repair procedure may vary.