Practical, on-site guidance for installing IZOTITE airtightness and sealing products. Each guide below covers the key steps, common mistakes to avoid, and links to the relevant product.

IZOTITE 50/50 Window Tape – External Window Sealing

Used to seal window and door openings from the external face on ICF, timber frame, and block-built projects. The 50/50 split release liner allows the tape to be evenly bonded between the window frame and surrounding substrate.

Video Guide

Installation Steps

1. Clean and dry the window frame and surrounding substrate — remove dust, loose material, grease, and any moisture.

2. Peel back one side of the 50/50 split release liner and position the tape onto the window frame.

3. Press firmly to bond, then remove the remaining release liner and bond the tape back onto the surrounding reveal or substrate.

4. Ensure full contact across the tape, paying particular attention to corners and changes in direction.

5. Lap joints by a minimum of 50mm and ensure all corners and junctions form a continuous weather-resistant seal.

Compatible with: EPS, timber, concrete, blockwork and PVC window frames

IZOTITE Window Tray – Sill Drainage

Pre-formed PVC window trays that provide a drainage plane at the sill.

Video Guide

Installation Steps

1. Measure the window opening width and cut the tray to length, allowing for end jams.
2. Fit end jams and seal joints with compatible sealant or tape.
3. Bed the tray into position on the sill, ensuring a slight fall to the exterior for drainage.
4. Seal the front edge to the ICF.

Need Help on Site?

If you have a specific installation question or need technical support, get in touch with our team