![Roof Spread and How To Resist It - G C Robertson & Associates Ltd - Consulting Civil & Structural Engineers Roof Spread and How To Resist It - G C Robertson & Associates Ltd - Consulting Civil & Structural Engineers](http://gcrobertson.co.uk/wp-content/uploads/2018/03/Figure-7-Collar-and-Purlin-roof.jpg)
Roof Spread and How To Resist It - G C Robertson & Associates Ltd - Consulting Civil & Structural Engineers
![Roof Framing: definition of types of rafters, definition of Collar Ties, Rafter Ties, Structural Ridge Beams, causes of roof collapse & wall spread. Roof Framing: definition of types of rafters, definition of Collar Ties, Rafter Ties, Structural Ridge Beams, causes of roof collapse & wall spread.](https://inspectapedia.com/structure/Roof_Framing_118_DJFs.jpg)
Roof Framing: definition of types of rafters, definition of Collar Ties, Rafter Ties, Structural Ridge Beams, causes of roof collapse & wall spread.
![Roof Framing: definition of types of rafters, definition of Collar Ties, Rafter Ties, Structural Ridge Beams, causes of roof collapse & wall spread. Roof Framing: definition of types of rafters, definition of Collar Ties, Rafter Ties, Structural Ridge Beams, causes of roof collapse & wall spread.](https://inspectapedia.com/structure/Roof_Framing_116_DJFs.jpg)
Roof Framing: definition of types of rafters, definition of Collar Ties, Rafter Ties, Structural Ridge Beams, causes of roof collapse & wall spread.
![How to ensure your pitched roof is up to the job | Building surveyor Cambridge | Anglian Home Surveyors How to ensure your pitched roof is up to the job | Building surveyor Cambridge | Anglian Home Surveyors](https://www.anglianhomesurveyors.com/site/assets/files/1129/building_surveyor_cambridge_removed_collars.572x0-is.jpg)
How to ensure your pitched roof is up to the job | Building surveyor Cambridge | Anglian Home Surveyors
![Roof Framing: definition of types of rafters, definition of Collar Ties, Rafter Ties, Structural Ridge Beams, causes of roof collapse & wall spread. Roof Framing: definition of types of rafters, definition of Collar Ties, Rafter Ties, Structural Ridge Beams, causes of roof collapse & wall spread.](https://inspectapedia.com/structure/Rafter-tie-locations-118-DJFs.jpg)
Roof Framing: definition of types of rafters, definition of Collar Ties, Rafter Ties, Structural Ridge Beams, causes of roof collapse & wall spread.
![File:Braced collar beam roof, chancel of St Junabius - geograph.org.uk - 958748.jpg - Wikimedia Commons File:Braced collar beam roof, chancel of St Junabius - geograph.org.uk - 958748.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/a/a8/Braced_collar_beam_roof%2C_chancel_of_St_Junabius_-_geograph.org.uk_-_958748.jpg)