If further ventilation is required, install one lap vent into every rafter space at low level or into lap joints at higher level. To provide typical ventilation, allow for 1 lap vent every alternate rafter space at low level, on opposite sides of the roof.
eBay
Patio All-Iron Gazebo,Hard Top Lean to Gazebo Pergola with Roof,Wall Mounted Heavy Duty Awnings, for Outdoor, Backyard
Aliexpress UK
Vent3 Light has a printed (dark grey) upper surface with preprinted marking lines and a white under-face. It will allow the escape of water vapour from within the roof structure whilst protecting against wind driven rain, snow and dust which may penetrate the main roof waterproofing, providing a permanent quality breather underlay, which will last the life of the roof construction.
eBay
3 x 3 m Retractable Roof Pergola, Gazebos - Natural Wood Finish
Aliexpress UK
BBA Certified. Vent3 Classic is a breathable roof underlay for cold and warm roof applications which give major benefits over traditional roof underlays. Cold & warm roof application. Light grey surface prohibits glare.
eBay
z 10' x 14' Outdoor Pergola Gazebo, Wall-Mounted Lean to Metal Awnings Gazebos on Clearance for Patio, Large Panel Roof Pergolas
Aliexpress UK
If further ventilation is required, install one lap vent into every rafter space at low level or into lap joints at higher level. To provide typical ventilation, allow for 1 lap vent every alternate rafter space at low level, on opposite sides of the roof.
eBay
Slanted Roof Pergola Bracket Kit With Wall Mount And Screws For 4x4 Inch Wood Posts Gazebo Porch Garden Gazebo Parts Accessories
Aliexpress UK
12 X Felt Lap Vents, Loft Vents for Condensation, Roof Ventilation Lap Vents, Felt Lap Vents Prevents Loft Roof Condensation, Keep Attic Space Ventilation Airflow. Felt Vents for Loft: Each unit will provide 3000mm² of free airflow into the loft space.
eBay
Ye Retractable Pergola Shade Cover, Replacement Canopy Fabric for 3 x 3 (m) Pergola, Gazebo Retractable Roof, Dark Grey
Aliexpress UK
Cromar - Vent 3 PRO- GREEN THICK- 1m wide Performance/QUALITY. It is equally suitable whether draped unsupported over rafters, laid directly over insulation.
eBay
Outdoor swing chair canopy garden waterproof swing canopy roof outdoor swing chair hammock canopy
Aliexpress UK
Felt Lap Roof Vents are a quick and easy solution for improving loft ventilation and preventing condensation. Designed for universal use, they fit seamlessly between joists spaced from 350mm to 600mm.
eBay
Outsunny 4 x 3(m) Aluminium Outdoor Pergola with Retractable Roof, Outdoor Gazebo Canopy Shelter with Grommet Holes
Aliexpress UK
If further ventilation is required, install one lap vent into every rafter space at low level or into lap joints at higher level. To provide typical ventilation, allow for 1 lap vent every alternate rafter space at low level, on opposite sides of the roof.
eBay
Outsunny Outdoor Patio Wall-mounted 4.35 x 3(m) Gazebo Pergola, Aluminum Post, PC Roof
Aliexpress UK