Indian sandstone · Rawdon LS19

Restoring Indian sandstone patios in Rawdon

Green film, black spot and rust marks on riven Indian sandstone.

By the time we're called to a Rawdon sandstone job, the flags have usually kept their colour under planters and lost it everywhere else — a good sign the stone is fine underneath.

We work Rawdon and the surrounding LS19 postcodes every week, so a Indian sandstone job here is a scheduled call, not a special trip.

Where it goes wrong

What ruins indian sandstone in LS19

1acid washes strip the natural buff/grey tone and leave the stone chalky
2leaving black spot untreated lets the lichen root into the pore structure
3high-pressure rotary picks the softer laminations off the riven face

What indian sandstone actually is

Defining traits in Rawdon

riven, sawn or tumbled natural stone imported in mixed-tone crates
hand-cut edges that give the slab its shadow line
iron traces in some crates that oxidise into rust freckling
porous surface that drinks water and holds algae in shaded gardens

Chemistry

What we use, and why

Neutral-pH biocide first, then a lichen-specific oxidiser only on the black spots — never neat bleach onto Indian sandstone.

Our process

How we clean indian sandstone

Step 1

soft-wash biocide 24 hours before to lift the algal film at root

Step 2

hand-scrub or low-pressure rotary at reduced head pressure for the riven face

Step 3

targeted stain-specific treatment on rust freckling and lichen dots

Step 4

clean rinse and joint check with polymeric or kiln-dried refill as needed

Aftercare

Keeping it right

Sweep leaves weekly through autumn, keep planters off the flags for a week after cleaning, and re-treat biocide every 12–18 months.

Timing

When to book

April to October gives the stone time to dry between passes; autumn cleans on shaded gardens should be paired with a residual biocide.

Typical use: rear garden patios, wrap-around terraces, steppingstone paths, pool surrounds.

Rawdon Indian sandstone FAQs

Do you cover the whole of LS19?: Yes, plus surrounding postcodes on the same round — most Rawdon customers get a same-week visit.
Do you seal Indian sandstone after cleaning?: Only on request — sealing changes the tone, so we walk Rawdon customers through the finish choice on site before booking anything in.
Do you re-sand the joints on sandstone?: Depending on the joint spec we'll top up kiln-dried or polymeric sand at the end; we quote the correct one on site.
Will pressure washing damage my Rawdon Indian sandstone?: It can if you go straight in with a rotary — we soft-wash first and only run reduced-pressure passes on the harder-standing joints.
How long will a LS19 sandstone patio stay clean?: 12–24 months in a shaded Rawdon garden, longer if you sweep leaves off through autumn.