Roof Cleaning Services in Penzance
Granite does not care about the weather and mortar cares a great deal. The buildings here were made of the hardest stone in the country and roofed in slate that will outlast most of us, which sounds like a combination nothing can trouble. What holds all of it together is lime or cement pointing at the verges, the ridge and around every stack, and that pointing is the softest thing on the building by a considerable margin. Owners watch a verge slate drop and assume the roof is failing.
Wind-driven rain finds it first. Weather arrives here horizontally rather than falling, so it hits verges and ridge lines rather than running down slopes, and it works into any joint that has started to open. Growth then settles in the same places, holds the moisture there and keeps the mortar permanently damp. The slate stays perfect while the pointing that secures it crumbles quietly, and a verge slate ends up in the garden after a night nobody thought was especially rough.
Keeping the mortar lines clear is what protects the covering.
Ben's Roof Cleaning offers experienced roof cleaning in Penzance with the verges, ridge and stack pointing cleared and photographed while the slopes are treated. Nothing is picked at or raked out. Describe the property and a price comes free. Anybody who has owned a granite house knows how little the stone minds. The material outlasts everything anybody fixes to it or bedded around it. What gives way is the mortar rather than anything structural.
About Penzance
Penzance rises from its harbour in granite terraces and villas, with slate roofs across almost the whole of the older town and later housing spreading up the hill behind. Mortar-pointed verges, bedded ridges and rendered or pointed stacks are the norm on that stock. Slate covers nearly all of that stock on generous pitches.

The bay lies open to the south and Atlantic weather comes across the peninsula from the west. Rain here arrives driven rather than falling, hitting verges, ridges and gable ends far harder than it hits the slopes themselves. Later housing climbs the hill behind the older town.
Truro is the primary service area for roof cleaning in Penzance, reached along the road down the county. Granite and slate property under identical exposure repeats along that route, so failing pointing is a familiar finding. Atlantic weather crosses the peninsula from the west continuously.
What Driven Rain Does to Penzance Pointing
Weather arrives sideways here. Driven rain hits verges, ridges and gable ends rather than running down the slope, so it attacks the mortar rather than the slate. Pointing kept permanently damp gives way one winter at a time. Soaked pointing never dries between one blow and the next. Joints rather than material are where these roofs give way.

Growth holds the moisture in place. Moss along a verge or a ridge line keeps the pointing permanently damp, which is exactly the condition mortar cannot survive. Nothing about the stone itself deteriorates under this weather. Failure arrives at the joints rather than in the material. Stone here outlives the mortar holding it by generations.
The stone stays perfect throughout. Granite and slate outlast the mortar securing them by generations, so the covering fails at its joints rather than its material. Driven rain strikes the verges rather than running down the slopes. Horizontal rain reaches the gable ends rather than the slopes. Nothing about granite deteriorates under this sort of weather.
Our Services in Penzance
What our customers have to say...
Clearing the Mortar Lines on a Penzance Roof
Verges and ridges are cleared first. That is where the mortar sits and where driven rain concentrates, so opening those lines up does more than working the open slope. Nothing is raked, probed or picked at where mortar has softened. Every line is photographed for whoever prices the repointing.

Nothing is raked, picked or tested. Pointing that has started to go is left exactly as found and photographed, because probing at soft mortar makes a repair urgent rather than planned. Photographs record each line for whoever prices the repointing. Nothing is raked or probed where the pointing has softened.
The slopes are treated afterwards. Slate holds growth less readily than tile, so full coverage keeps the verges from being reseeded by the covering above them. Verges and ridges are cleared before the open slopes are treated. Mortar lines are cleared before the open covering is treated. Neighbouring properties are frequently scheduled together.
How Penzance Roofs Are Handled
Weather governs the schedule. Ben's Roof Cleaning holds professional roof cleaning in Penzance to a risk assessment drawn up per property, insured throughout, and Atlantic conditions move a date rather than being worked through. Findings name the verge, the ridge and the stacks separately.

Nothing is disturbed to prove a point. Loose pointing stays where it is until a mason or roofer decides what to do, rather than being made worse during a clean. Owners hear which lines are failing and roughly how urgently. Weather here moves an attendance rather than shortening it.
The report names the lines. Which verge is failing, where the ridge has opened and what the stack pointing looks like all go in with photographs for whoever prices the work. Nothing is disturbed to demonstrate that a joint has gone. Findings name the verges, the ridge and the stacks separately.
Arrange a Penzance Roof Visit
Two details will price it. Ben's Roof Cleaning has offered dependable roof cleaning in Penzance for over 15 years. Send the address, how exposed the property sits and whether any slate has come loose. Written notes describe each line and its condition separately. Neighbouring properties are frequently scheduled together.

One agreed figure covers the roof: verges and ridge cleared, the pointing photographed, the slopes treated and the ground left clear. Costs are settled before the date. Neighbouring properties are frequently scheduled together. Costs take in every mortar line rather than the visible ones. Access arrangements are settled alongside the price.
Write or ring with those details. Pointing that has begun to go is worth recording before winter finds it. Ask us for a figure and we will pick a settled week. Photographs of any loose slate help before the attendance. Rough intervals reflect the exposure on this particular coast.
Frequently Asked Questions
If granite and slate last so long, what fails?
The mortar between them. Pointing at the verges, ridge and stacks is the softest material on the building and takes the worst of the driven rain. Mortar fails before granite. Driven rain hits the verges. Growth holds the moisture.
Why does the weather hit the verges hardest?
Because rain here arrives horizontally rather than falling. It strikes gable ends, verges and ridge lines rather than running gently down the slopes. Driven rain hits the verges. Growth holds the moisture. Masons handle repointing. Slates drop from failed joints.
Does moss make the pointing fail faster?
It holds moisture against the mortar and stops it drying, which is precisely the condition that lets frost and weather break it down over time. Growth holds the moisture. Masons handle repointing. Slates drop from failed joints.
Will you rake out the loose mortar?
No. It stays exactly as found and gets photographed, since probing at soft pointing turns a job that could be planned into one that is urgent. Masons handle repointing. Slates drop from failed joints. Blows move a date.
What causes a verge slate to drop?
Failed pointing almost always. The slate itself is usually sound; what was holding it in place has crumbled quietly over several winters. Slates drop from failed joints. Blows move a date. Stone lasts generations here. Lines need keeping clear.
Can you work in Atlantic weather?
Not in a blow. Dates move for safety and because a treatment applied into that wind reaches very little of what it is meant to cover. Blows move a date. Stone lasts generations here. Lines need keeping clear.
Is slate better than tile for this coast?
It handles the exposure well, which is why it has been used here for centuries. The maintenance question is always the mortar rather than the stone. Stone lasts generations here. Lines need keeping clear. Mortar fails before granite.
How often should a roof here be looked at?
Every three years. Keeping the mortar lines clear and dry is what extends them, and this coast gives them a hard time between visits. Lines need keeping clear. Mortar fails before granite. Driven rain hits the verges.
