Mossy Roof Clean - Northampton (October 2024)

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

Overview

One of our 2024 projects was a residential roof clean in Northampton. The job took place in October. Across ridges, valleys, and tile faces, heavy moss growth covered the concrete tile roof. Our strategy was simple, yet effective: manually scrape the moss, run a soft wash cleaning, and apply a DDAC biocide for long-term prevention.

The project, in a nutshell

Where: Northampton
When: October 2024
The roof type: Concrete tiles
The main issue to address: Heavy moss growth
How did we do it: Manual scrape + soft wash + DDAC biocide

The hard row to hoe

In the ridges and valleys, moss was thick and tricky to remove - to say the least. Plus, it was spread across the tile faces. Using an aggressive cleaning method wasn’t an option - it would have damaged the concrete tiles. A controlled cleaning method had to be used. Moss debris, washed down from the roof surface over time, was also blocking the gutters. Not an easy project, for sure.

Which path did we take?

Working from ridge to eave, we manually scraped the moss. This way, we didn’t damage the tiles, but managed to get rid of the bulk of the growth. High-pressure methods simply cannot achieve the same results. We then used low-pressure soft washing to remove all remaining organic growth, algae, and staining from the tile surfaces. We finished by applying a DDAC protective biocide treatment across the entire roof surface. This treatment should prevent moss and algae regrowth for 4-5 years.

All said and done

The roof was clean, free of moss, and all its tiles were intact. We cleared all ridges, valleys, and tile faces. As for the gutters, they were, once again, free of any moss debris.

A side note on aftercare

The DDAC biocide actually activates when it rains, and it continues working in the months following application. It can take 6-12 months for the full effect to be visible. The treatment keeps organic growth from returning across the treated surfaces. Impressive, right?