How to Remove Moss from Roof

Having moss on the roof of your home is far from the worst thing that could happen to it. In fact many people like the aged look it gives a home, especially if the style of their house fits with that greened rural effect that moss can give. A green roof shows off a healthy local environment and it can make your home stand out. In fact, many people encourage it, with eco-homes boasting of their green roofs, which are usually moss-based.

In most cases moss won’t impact upon how well the roof functions or whether it leaks. It can slow down the flow of water to your gutters and this could damage tiles over a very long period of time, but you only really need to deal with moss if it begins to look unsightly, especially if patches begin to die off. In this case it can be advisable to strip your roof of the moss. You may also want to consider how to remove moss from roof if the moss grows enough to block gutters, although a good roofing contractor or handyman should be able to fit an edging or gutter guard to the roof to stop this being a problem.

how to remove moss from roof

Image source: Geograph

How to remove moss from roof

Removing moss is a job for someone who has experience of working on roofs and it can be expensive to do if your contractor has to put up scaffolding to work on the roof. A small house will take a day to clear and a larger one will take two days. So you can expect to pay anything from £400 to £1500 when you take materials and scaffolding into account. Always ask if the price includes scaffolding and whether it will be needed.

A chemical wash will usually be used to remove the moss from your roof. The wash will be applied and then any tough parts can be brushed off by your trade member or removed with a trowel (often a rubber-edged trowel). This is the most gentle way to do the job, as pressure washing can dislodge tiles, while simply scrubbing the roof clean can damage tiles and leave scrape marks.

roof moss removal

Image source: capreoara K via Flickr

Pressure washing can also have the effect of spreading the moss around, whether that be to other parts of your roof or down below on your patio. You should also be careful when washing down a roof with chemicals if you have plants in your garden beneath the roof. Always tell your trade member if this is a concern.

If you want to inhibit new moss growth then you can have copper strips or wire fitted to the top of your roof. Copper is used in many weed control mixes, so you can be sure it will do the job, as well as keeping the roof clear permanently.

The residue that washes down on to your tiles will stop new moss from being able to take hold but it can lead to roof discolouration. You should avoid this method if you have aluminium guttering, as they will be corroded by the run off from the copper strips.

The general rule of thumb is if your roof is functioning and the moss looks healthy then leave it well alone. You could end up paying out a lot and potentially damaging your roof tiles. Act if you need to or really want to get rid of the moss, but rest assured that a natural growth of moss is unlikely to damage your home.

Need some help removing moss from your roof? Post a job on Rated People in our roofer category to receive quotes from our qualified and trusted tradesmen.

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5 comments

  1. Not necessarily true in my view. Moss on clay tiles in particular can be very damaging holding in water which turns to ice in winter with the breaking up of the tile surface the result inn the spring. Direction of pressure washing is also critical if it must be usedRegards Gary

  2. what about if its a corregated asbestos roof. i would not want to risk scraping it. should i kill the moss with bleach or chemicals

  3. Our Semi has moss on the roof, we were making arrangements to have it removed when the builder backed out saying that we have asbestos tiles and they would not attempt to clean them! do you have any suggestions please. Kind Regards Jo

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