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Battens

Where ventilated battens form a part of the ventilation design, longer roof fasteners must be used to achieve the required penetration into purlins.

Structural battens can be fixed with countersunk purlin screws or, if fixed with hex head screws, they should be counter bored before installation to avoid the screw head damaging the roofing.

Steel top hat, C or Z sections are also used as counter battens but require an additional insulating spacer to avoid thermal bridging.

 

Z Counter Battens 

 

 

 

 

 

 

 

Ventilation Pathway: Top Plate with Underlay

 

Ventilation Pathway: Top Plate with Fleece

 

 

 

 

 

A printable bulletin is available at: BEF01Position of Eaves Flashing to Underlay.

Extract:
"Eaves flashings are traditionally laid between the underlay and the eaves purlin. This is not always necessary, or even desirable..."

 

 

Clause: 
010_010_002_000_000_000_000_000_000
Clause Number: 
10.10.2
/cop/internal-moisture/ventilation-pathways#battens
Revision Category: 
2 - Editing and rearrangement
Revision Detail: 

This clause has been revised during the overall review of Ventilation Pathways and the drawings have been updated.