Pergola beams

[joeandrews]

I want to run some pergola beams, connected to the house at one end and spanning over my deck, each 47 x 150.

The span is 4.0 metres.

Will this be okay, they will not bear any weight, but I was worried they may twist and buckle over time.

Any help appreciated.

 

[Harbourwoodwork]

They will bend over that distance,The only way to stop that is ,fit noggins between or fix timbers transversally .

 

[joeandrews]

How often should I fix noggins?

 

[Harbourwoodwork]

break the job up into equal bays say about 4 ft,Fixing timbers over the top would be easier to fix and look a bit better than noggins and stiffen it up a bit too .

 

[joeandrews]

Thanks for your reply.

You mean take another 47 x 150 timber and lay it across the pergola main beams (at 90 degrees), cutting notches so the timbers slide into each other?

This means adding weight to the main pergola beams, does this matter?

 

[Harbourwoodwork]

some good tanalised "2x2" well fixed would do the job, notch in sounds like a very worthy task but would not stand up in the commercial world, some No 10 screw's should do it,or the cheap screw bolts from screwfix are grand for garden structures,