Overview
- Check for leaks with the simple paper test by slipping a sheet between frame and sash or door and frame and seeing if it pulls out easily to locate gaps.
- For small frame gaps use self‑adhesive profile seals made of rubber rather than thin foam or ordinary tape because rubber lasts longer and keeps doors closing smoothly.
- A gap under the door needs a door‑bottom seal, brush strip, or adjustable sill kit rather than a frame strip, and you should recheck the fit after installation to ensure the lock still works.
- Tenants should document and notify landlords in writing about significant drafts because German law normally makes landlords responsible for keeping dwellings in contract‑conforming condition and ordering larger repairs.
- Seal carefully to avoid moisture and health risks by continuing regular shock ventilation, avoiding blocked vents, and seeking professional advice before sealing rooms with air‑dependent gas appliances; low‑income tenants may ask Jobcenters to consider higher heating costs when housing is poorly insulated.