How to Replace Existing Trusses with Prefabricated Trusses How to Replace Existing Trusses with Prefabricated Trusses

What You'll Need
Prefabricated trusses
Tape measure
Penny Nails
Boards for planks
Pry bar

Prefabricated trusses are preferred by most builders due to the convenience they offer. Prefabricated trusses do not require any special tool or heavy equipment to install. They are preferred by a lot of home builders, as prefabricated trusses can allow them to make roofs with speed and accuracy. They are also suited to ceilings with complex and varying designs. Follow the simple steps below to effectively replace your old trusses with prefabricated ones.

Step 1 – Removing the Old Trusses

Before you can install the new trusses, you need to first remove the old ones. Loosen the bolts that connect the planks and the trusses, and then pry away the old planks. Remove whatever bolts are keeping the trusses in place, and remove them altogether. Using clean rugs, wipe off the dirt and other debris on the space where the new trusses are to be installed.

Step 2 – Marking the Spot for Installation

To identify the spots where to station your trusses, you have to mark every 24 inches of your top wall plates. Designate a shape for this such as a circle or an X mark to distinguish this spot from the spot where the edge of the trusses will be positioned. The location of the edge of the trusses will be ¾-inch back in between the 24 inches interval, while the X mark represents the center of the truss.

Step 3 – Setting the Trusses

Position two trusses in each spot you made. The center of the truss should be placed on the X mark and the edges should be inside the smaller mark made. Starting at the top portion of the wall plate, nail down one truss using a penny nail. About 16 penny nails will be enough to secure the truss in its position. Make sure that the top pf the wall meets the bottom part of the truss.

Add another truss on the succeeding mark. Then, on top of the two installed trusses, place a 2x4 board that measures 8 feet long. Slide the remaining trusses beneath the board, but still following the marks designated for the trusses. The board will temporarily bind the trusses together.

Step 4 – Installing Cross Bracing to Stabilize the Truss System

To firmly secure the trusses, add on braces on the bottom and top of the trusses at an angle. Do not remove these braces or the support you installed on top of the trusses until you complete the next step.

Step 5 – Additional of Plywood

Remove the board that you placed on top of the trusses earlier, and replace it with plywood. Nail down the plywood to secure it in place.

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