Lime render and plastering for older South Devon homes
Lime render and plaster can suit older buildings whose solid walls need to manage moisture differently from modern cavity construction. For cob and stone homes, the background and existing finishes matter as much as the final appearance. Send ADB SW details of your period-property renovation, including photographs of damaged areas and known previous repairs, so we can discuss preparation, material compatibility and the intended finish.
Work with the way solid walls handle moisture
Older solid walls can absorb and release moisture through their materials and finishes. Breathability describes this moisture behaviour; it does not mean the wall should admit rain or that ventilation is unnecessary. A suitable lime finish can allow drying while accommodating the character of the background. Roofs, gutters, drainage and ground levels still need attention, because a breathable coating cannot compensate for persistent water entering the building.
Cob and stone are not identical backgrounds, and neither should be specified from appearance alone. The condition of the wall, mortar, previous coatings and degree of exposure all influence the approach. Lime type, aggregate and mix should suit the particular fabric. Listed buildings and other protected properties may also need consent for changes to materials or finishes, so establish the requirements before stripping or replacing historic work.
Assess cement, gypsum and earlier repairs
Hard cement-rich render can be too rigid or restrict drying on some older walls. Water entering through cracks may then remain behind the coating, contributing to deterioration of weaker masonry or cob. Gypsum plaster can be unsuitable on persistently damp, salt-affected backgrounds, where it may soften or fail. These materials are not wrong everywhere, but their behaviour needs to match the construction and moisture conditions.
Removing an incompatible finish needs care, especially where the background is fragile or historic material survives underneath. The scope should allow for assessment as areas are exposed rather than assume every wall will be sound. Some existing finishes may be retained where appropriate. Decisions about removal, repair and replacement should follow the condition of the fabric, not a blanket rule that every old surface needs stripping.
Connect rendering, plastering and lime pointing
External render protects the wall face, internal plaster forms the room finish, and pointing repairs the joints between masonry units. Each needs a compatible relationship with the wall. Deteriorated joints may need attention before rendering, while exposed stonework needs pointing suited to its condition and exposure. A strong, dense mortar is not automatically better where the surrounding stone is comparatively soft or moisture-sensitive.
Preparation can include removing loose material, dealing with salts appropriately and managing suction before coats are applied. The number and thickness of coats depend on the background and specification. Junctions with other materials need consideration too. Lime work requires suitable curing and protection from rapid drying, frost and driving rain; it should not be rushed to follow a decoration schedule designed for a different material.
Investigate cracking and choose compatible finishes
Cracking can relate to rapid drying, background suction, coat thickness, movement or an unsuitable mix. Bubbling or lifting may indicate poor adhesion, trapped moisture, salts or a problem with the coating applied over the plaster. The pattern and timing help guide investigation, but photographs alone cannot establish every cause. Covering symptoms with another dense finish can make it harder to understand what is happening underneath.
Decoration should support the intended moisture behaviour rather than seal the surface without thought. Discuss compatible paint or wash choices and readiness for decoration as part of the specification. For an enquiry, include the property location, known wall construction, previous damp problems and photographs showing whole walls as well as defects. We can then discuss the affected rooms or elevations, preparation, access and how the lime work fits your wider renovation.
Common questions
Why is my lime render cracking?
Possible causes include rapid drying, excessive suction, unsuitable coat thickness, an inappropriate mix or movement in the background. Fine shrinkage cracks and deeper recurring cracks need different responses. Assess the pattern, exposure and wall condition before deciding whether local repair or broader investigation is needed.
Why is my lime plaster bubbling?
Bubbling may involve the plaster itself or the decoration above it. Moisture, salts, poor bonding and incompatible coatings are possible factors. Identify which layer is lifting and investigate the background before removing material or applying another finish.
How much is lime plaster?
Cost depends on area, background condition, removal of existing finishes, preparation, coat build-up and access. Curved surfaces, detailed reveals and protection or curing requirements also affect the work. A useful quotation describes the complete preparation and finish rather than just the material.
Tell us about your project
Send the property details and the work you have in mind so the scope can be discussed before a quote is agreed.