Weatherseal Cutters
Weatherseal cutters are specialist router bits used to cut clean, uniform channels in timber doors and window frames for rubber or foam weather seals. Ideal for site joinery, replacement seals and frame prepping.
What Are Weatherseal Router Bits For?
These bits allow fast routing of grooves to house compression or brush seals around door and window frames:
- Timber Door Frames – Create a slot for draught or acoustic seals.
- Window Casings – Rout rebates to insert brush seals or foam strips.
- Upgrades & Refits – Retrofit seal channels into existing frames.
- Threshold & Sill Detailing – Use to seat bottom seals or gaskets on outward-opening joinery.
Used By:
- Joiners building or fitting timber doors and windows
- Fire door installers prepping acoustic seals
- Renovators upgrading older doors to meet insulation regs
- Shopfitters fitting commercial doors or draught systems
Choosing a Weatherseal Cutter
Profile and accuracy matter — look for clean groove shape and correct slot dimensions:
1. Slot Width
Check seal specs — most are 4mm–6mm wide. Your cutter must match for a secure fit.
2. Cut Depth
Standard depths are 6mm–10mm. Ensure clearance for full seal compression without protrusion.
3. Cutter Quality
TCT tips last longer and give sharper, cleaner grooves especially in hardwood or painted timber.
Weatherseal Cutter FAQs
What is a weatherseal cutter?
It’s a router bit designed to cut grooves for weatherproof seals in timber doors and windows. The groove holds brush or compression seal strips securely in place.
What type of seals are they used with?
Mainly rubber bulb seals, brush seals, and fire/acoustic strips. Always check groove size requirements for the product.
Can I use them on painted or veneered doors?
Yes — TCT cutters are suitable for pre-finished timber. Always use shallow passes and proper dust extraction for surface protection.
What router should I use with these?
A small plunge router or palm router is ideal. Some use guide jigs for straight slot routing around the frame or sash.
Are these compliant for fire or acoustic doors?
Yes — when used with compatible seals and routed accurately, they help achieve acoustic or FD30/FD60 fire ratings. Always follow seal guidelines.
