No, you shouldn’t make structural modifications like this without them being approved by a properly licensed and certified structural engineer.

Can I remove purlins?

Supported in side walls. – PURLINS When you remove the old purlins (or their struts), bang goes their support! Adding new steel or manufactured timber purlins is one way of compensating. – RIDGE Normally required to support large dormer flat roof joists and to strengthen the existing ridge.

Can you alter trusses?





Don’t Modify / Cut Wood Trusses



If you live in a house with engineered, manufactured trusses then don’t mess with them. If you really want to modify the framing of your attic and roof then consult with a licensed professional structural engineer.

Can you cut roof trusses?

Home owners should avoid cutting or modifying their roof trusses. These trusses are usually engineered by a structural engineering company to carry a specific roof load. When a truss becomes damaged, cut or modified there is a chance of a structural overload or that they will not perform properly.

Do I need a purlin?

Different purlins are used for different purposes, including structural support of walls or floors. Purlin is important because without it, there’s no frame for the sheeting on the roof to rest on, making purlins critical to the structure of the roof.

Can you remove purlin struts?

In short, do not remove the struts unless you have load bearing walls or RSJ’s directly underneath your purlins which you can support off BEFORE you remove the struts, which you don’t appear to have.

Can you do a loft conversion with roof trusses?





The key to converting a loft with a trussed roof is to remove the beams while maintaining triangular support. This is achieved by inserting steel or timber beams across the length of the floor to create new floor joists and attaching them to the roof slopes.

Can you extend roof trusses?

Can you extend roof rafters? Yes, you can nail rafter extensions onto existing rafters. Rafter extensions are pieces of lumber that you can install onto the rafters of your roof. They’ll extend the total length of your rafters and allow you to support the weight of a small overhang.

How do you turn a truss into a rafter?

Quote from the video:
Quote from Youtube video: You're probably going to end up using two by tens or two by twelves verses your standard 2×4 or 2×6. As the top cord of a roof truss and the top of the roof. Rafter will look something like this.

Can I cutting roof trusses for loft hatch?

A word of caution: Prefabricated roof trusses must not be cut without consulting a structural engineer as every part will have been carefully calculated to give maximum strength for minimum timber, cutting any part will destroy the integrity of the truss and could lead to a structural failure.

What is the purpose of the purlin in a roof truss?



Purlin plates are beams which support the mid-span of rafters and are supported by posts. By supporting the rafters they allow longer spans than the rafters alone could span, thus allowing a wider building.

Are roof purlins structural?

In architecture or structural engineering or building, a purlin (or purline) is a horizontal structural member in a roof. Purlins support the loads from the roof deck or sheathing and are supported by the principal rafters and/or the building walls, steel beams etc.

What do purlins do in a roof?

PURLIN – a horizontal timber or steel beam which creates support for the roof rafters. PEGGED ‘A’-FRAMED TIMBERS – Timbers that are pegged or slotted in together and in a shape of an ‘A’. They support the roof structure of the building and loft space.

How do you strengthen an old roof truss?



Reinforce the Trusses

  1. Apply construction adhesive along the edge of the truss to strengthen the connection to the plywood roof deck. …
  2. Stiffen trusses by joining them with 2x4s running from one end of the house to the other.
  3. Brace gable ends with diagonal 2x4s.
  4. Connect trusses to walls with hurricane tiedowns.

Can I remove rafter ties?

With a properly engineered structural ridge, rafter ties can be eliminated completely.

Can you convert a loft with low beams?

Raising the roof is a common way of creating extra ceiling height within a loft conversion. If you suspect you’ll have an issue with a loft conversion low ceiling, you will usually require planning permission if your specialists suggest raising the roof. This is because the roof structure and shape will be altered.

How do you know if your loft can be converted?

The main ‘pinch-point’ with loft conversions can be summed up in a single word – headroom. To see whether your loft makes the grade, simply stand under the highest point of the roof, usually in the centre of the loft, and check whether there is at least 2.8m clear vertical space.

Can you make your roof higher?



You can still raise stick roofs, but it will most likely require you to tear down the existing roof and rebuild the structure. A few factors could make raising your roof impossible, or incredibly costly.

Can I convert attic with trusses?

There is no problem converting a trussed roof provided you have two concrete block walls opposite each other in the attic, i.e., an apex or gable roof. Hipped trussed roofs can be converted but not as easily.

How do I convert truss to vaulted ceiling?

Quote from the video:
Quote from Youtube video: You might have a truss clip in your way. And that would require you to use a 2 by 6 or even a 2 by 8 to raise this up a little higher. But either way you're going to need to put a support.

Can you replace trusses without removing roof?

You can replace old, worn rafters without removing the roof. Most roofs have either a system of rafters and joists or of trusses.