January , 2026

Roof windows are excellent for natural light and ventilation, but they also represent a potential entry point if left unsecured. The VELUX ZOZ 012K1 security lock is a simple, key-operated accessory designed to make your centre-pivot roof windows more secure without affecting ventilation.

Short answer: yes, Kingspan insulation may require an air gap, but only in certain roof constructions. In others, adding a gap can actually reduce performance.

The key is understanding roof design, ventilation strategy, and airtightness. Installed correctly, Kingspan delivers excellent thermal performance. Installed incorrectly, gaps, draughts and moisture can significantly undermine it.

This guide explains when an air gap is required, when it isn’t, and why getting it wrong matters, using practical UK building principles rather than theory.