Mossy Roof Clean - Northampton (October 2024)

Residential concrete tile roof in Northampton after heavy moss removal, October 2024

Overview

Residential roof clean in Northampton, completed October 2024. The concrete tile roof had heavy moss growth established across ridges, valleys, and tile faces. Treatment involved manual moss scraping, soft wash cleaning, and a DDAC biocide application for long-term prevention.

Project Summary

Location: Northampton
Date: October 2024
Roof type: Concrete tiles
Main issue: Heavy moss growth
Method: Manual scrape + soft wash + DDAC biocide

The Challenge

Thick moss had become well established in the ridges and valleys, with growth spreading across the tile faces. Aggressive cleaning risked damaging the concrete tiles, so a controlled approach was essential. The gutters were also blocked with moss debris that had washed down from the roof surface over time.

Our Approach

Manual moss scraping - working from ridge to eave, removing the bulk of the moss growth by hand to avoid tile damage from high-pressure methods
Soft wash treatment - low-pressure cleaning to remove remaining organic growth, algae, and staining from the tile surfaces
DDAC biocide application - protective biocide treatment applied across the entire roof surface, providing 4-5 years of protection against moss and algae regrowth

Result

The roof was returned to a clean, moss-free condition with all tiles intact and undamaged. Ridges, valleys, and tile faces were all cleared. Gutters were left free of moss debris.

Aftercare

The DDAC biocide activates with rainfall and works gradually over the following months. Full effect is typically visible within 6-12 months as the treatment continues to inhibit organic regrowth across the treated surfaces.