Block paving restoration in Halifax

Halifax stands in a steep valley on the edge of the Pennines, and it is built in stone: the dark gritstone of the Calderdale hillsides, used for everything from the Piece Hall, the Georgian cloth hall in the centre of town, to the terraces that climb the valley sides. That stone and that setting make Halifax a very different place to work from the lowland towns further east.

The weather comes with the setting. Calderdale is among the wetter parts of West Yorkshire, and the valley sides mean that many frontages are shaded for much of the day in winter. For block paving the combination of damp, shade and stone is the main thing. Moss here is not an occasional visitor; it is the default.

Shade from the valley and from the walls

Many Halifax drives sit between high stone walls, or below a retaining wall holding up the garden above. Walls give privacy, but they cast shade and hold moisture, and they drop a steady trickle of grit and moss spore onto the surface below. On a drive like that the north side may never fully dry out between October and March.

The joints on the shaded side wear first, and they fill with fine, damp material that no amount of sweeping removes. Those joints need to be dug out and refilled, not just topped up.

Frost and the slip question

Wet algae on block paving is slippery, and on a steep Halifax drive that is more than a cosmetic issue. A thin green film on a gradient can be treacherous underfoot in winter, to a walker and to a car's tyres alike.

Washing it off gives a clean surface that is fine for a few months and slick again by the spring, because the spores and the damp conditions are still there. We treat the surface as well as washing it, which slows the return.

Sealing, moss and what a seal can and cannot do

On wet, shaded drives the question we are asked most is whether sealing will stop the moss. It will not. What a seal does is lock the sand in place and make the surface easier to keep clean, and a drive with firm, full joints is much less hospitable to moss than one with open joints.

So the order matters. Clean and treat first, refill the joints properly, and seal afterwards if it is worth it. On a heavily shaded drive we will sometimes say that a seal is not worth doing, and we would rather say so.

Savile Park, Skircoat Green and the villages

Skircoat Green and Savile Park have large Victorian and Edwardian houses; King Cross, Pellon and Boothtown sit on the hillsides closer in; Southowram and Shibden overlook the valley from the east. The housing is mixed and the drives are mixed with it.

Calderdale is large, and as you go further up the valleys the sites become more remote. For addresses on the far side of the district, ask first and we will tell you honestly whether it is within reach.