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Scaffolding on gable wall for Lime Pointing

Lime Pointing - Grade 2 Listed Farmhouse, Bolton-by-Bowland, Clitheroe, Lancashire

This project involved Lime Pointing a Gable elevation to this Grade II Listed Farmhouse in Bolton-by-Bowland, Nr Clitheroe, Lancashire. Our Restoration Team worked on this project for 4 weeks. The house is located between Clitheroe & Gisburn on the Forest of Bowland boarder. We used a Natural Hydraulic Lime Mortar or NHL for Lime Pointing the Stone wall. We sourced a local sand that would blend with the existing stonework.

Sheeting scaffolding for Lime Pointing A access scaffold was erected to the gable elevation. The scaffolding was saddled over a existing stone slate roof. The scaffolders laid bearing boards down on the traditional stone slate roof to prevent the slates from cracking. The scaffolding ad internal ladder access to the decks. We used Hessian & visqueen sheets to protect the Lime Pointing from the weather. The listed building Bolton-byBowland Nr Clitheroe has water ingress issues before we repointed with lime mortar. The problems with using a cement based mortar for pointing traditional sand stone buildings are that the cement mortars are hard and flexible. As the listed building moves thermally during the winter and summer months the hard non-flexible cement mortar de-bond from the sand stone masonry units.
Hessian Sheeting on Scaffolding for Lime Pointing Sheeting covering the Lime Pointing, we used Hessian. Covering the Lime Pointing can take a long time, but must be undertaken to prevent failure. After we removed the existing cement pointing, we used a Lime Putty based mortar for filling the voids in the wall. A Natural Hydraulic Lime or NHL was used for the Lime Pointing Mortar mix. Hydraulic lime mortar does have a slight hydraulic setting action hence the name. This hydraulic setting action is a long way off the setting strength of a cement based mortar. The lime mortar still depend highly on the carbonation of the lime element of the mortar. If the lime pointing mortar dries out prior to the carbonation process happening the lime mortar has failed. Once failed the lime mortar will turn a much "whiter" colour than the other pointing mortar.
Brushing Lime Pointing

A brush was used to beat the pointing to create a weathered look. The Lime Pointing needs to be protected for the weather elements. There are quite a few way of finishing lime mortar pointing. the traditional way is as pictured by "beating" back with a stiff churn brush or bassine brush. This opens up the surface area of the lime pointing mortar to allow more evaporation of the water. This also helps with the evaporation of any moisture within the wall. A the lime mortar pointing can crack slightly sometimes as it is drying the "beating" back with the churn helps consolidate any small cracking or crazing. Another traditional masons technical is to scrap back the pointing with a steel tool, this gives a more open texture to the pointing.

Finishing Lime Pointing The Lime Pointing when brushed gives a natural blend to the existing Stonework. Our Restoration Contractors working in Clitheroe, Lancashire are all skilled masons in masonry work. we work throughout the Ribble Valley on Listed Building and Traditional houses and cottages. The Ribble valley a large number of traditional listed building in the out lying areas such as Gisburn, Sawley, Bolton-by-Bowland, Whalley all these areas have original stone built properties with solid wall construction. Most Builders are not experienced or skilled in Lime Pointing or Lime Rendering. Contractors have different skills in certain areas of construction. Our Restoration Contractors are a skilled workforce in the Ribble Valley area.
Lime Pointing Gable Wall Gable elevation Lime Pointed with NHL Lime Mortar. We used a Hydraulic lime pointing on this elevation. The lime pointing mortar was mixed on site with a local washed sharp sand from Waddington Fell quarry. The Waddington Fell quarry is located Nr Clitheroe in the Ribble Valley, Lancashire. The sand supplied by Waddington Fell Quarry is ideal for the use with Lime Pointing mortar. The sand is also washed at the Waddington fell quarry. This removes lot of the silt and loom from the sand. The sand dries to a light red colour and softens over time. Period buildings in the Ribble Valley and Clitheroe are mostly re-pointed with a cement based mortar. This cement pointing causes water ingress, damp walls and mold internally.
Lime Pointed Gable Wall Now that the Gable Wall Lime Pointing the internal Damp on the internal wall has gone. Damp Walls internally are due to water ingress from the external. When a wall is Wet and Damp it can cause Mold growth on the plaster. The MOld is normally "black mold" which grows on damp walls. Water ingress is the most common problem for a Wet Damp Wall which can be mistaken for Rising  Damp. The Damp walls can cause the internal plasterwork to Blow or de-bond from the background. Rising Damp in old buildings or listed building can be just down to water ingress through the elevation. This will require the Damp Wall to be repointed with a Lime Pointing Mortar. Repointing stone walls with Lime Mortar should stop any water ingress which causes Damp.
Lime Pointing Lime Pointing on gable wall with scaffolding dismantled. When our Restoration Contractors in the Ribble Valley undertake Lime Mortar pointing we also look at other potential problems. One area that fails is the chimney leadwork. Leadwork on chimneys is normally poor now due to a lack of roofing skills. Our skilled contractors can undertake leadwork repairs to the chimney on the stone slate roof. The sand stone gable wall head also requires sealing under the stone slates, also the stone slates need sealing on the edge of the roof. Chimney pointing can also degrade and require repointing in Lime Mortar. The Chimney normally have large void due to the soot content. These voids need packing before re-pointing with Lime Pointing.
Removing Stone Corpings On this project we also re-bedded the corpings to this porch. The Stone Porch is said to be from Sawley Abbey, a local Abbey ruin. Part of the Restoration works to this Grade 2 Listed Building in Bolton-by-Bowland Nr Clitheroe, Lancashire was to restore the stone corpings stones to the porch roof. The roof of the stone porch is made up of sand stone roofing slates. We carefully removed the stone roof corping stone from the roof and stored on the access scaffolding. As the stone corping are very heavy we used a lifting plan. The stone roofing corping had been installed with cement mortar and not lime mortar. Roofs in the Ribble Valley area have stone corping stones on a stone slate roof. Our Roofing Contractors work in the Clitheroe area repairing roofs like this stone slate or sometimes called  grey slate roofs.
Stone Slate Roof with corpings removed

After removing the stone corpings we cleaned the Stone Slate Roof. We also removed the Stone Ridge Tiles. This left the stone roofing slates exposed. We removed the cement pointing from below the stone slates. Our Roofing Contractors are skilled Builders in stone Slate Roofing or sometimes called Gray Slate. Most stone slate roofs are in the North West of the UK and Lancashire does have a large number of stone slate roofs. This roof in Clitheroe is a Grade 2 listed building. The stonework for this small extension has reportedly been salvaged from Sawley Abbey in Sawley. The Extension has been re-pointed at some point with a cement based mortar. The stone ridge tiles had also been bedded on with a cement based mortar. As this mortar is strong it had cracked around the stone ridges. When our Contractors re-bedded the corpings they used a Lime Pointing Mortar.

Stone Corpings Bedded using Lime Mortar We used a Lime Mortar for bedding the Stone Corpings. They were also pointed with Lime Mortar. The Lime Mortar is able to accommodate the movement of the stone corpings. The stone ridge stones were also re-fit with a lime mortar. Our Restoration Building Contractors working on this Grade 2 listed building Nr Clitheroe undertaking Stone Slate roof repairs and Lime Pointing Lancashire. Building repairs on listed buildings should be by a skilled Builder in the Ribble Valley. We have worked on many Listed Building in the Ribble Valley area. This small extension in Clitheroe has water ingress and damp issues. Damp Problems in Old Building are mainly caused by modern building materials and methods. Damp Problems does cause health issues and a cold house. Our builders can undertake all types of work to Listed Buildings in the Ribble Valley.
Stone Ridge Tiles Bedded with Lime Mortar We used a Hydraulic Lime Mortar for bedding the Stone Ridge Tiles & Pointing. The Hydraulic lime pointing mortar was mixed with a local Waddington Fell sand. This gives the lime mortar a slightly red colour. The hydraulic lime was a NHL 3.5 our Craftsman used this due to the high level and exposure for the stone roof slates. When our Restoration Contractors work on listed building in the Ribble Valley they work closely with the local conservation officer. When working on Listed Buildings with Stone Slate roof or Builders peg on the slate with aluminum fixing pegs. These pegs rest on top of the timber roofing battens hold the stone slates in place. Less experienced Building and Roofing contractors will nail the slates to the batten. This makes changing broken Stone Slates or cracked Stone Slate difficult.
Lime Pointing on Stone Corpings Stone Corpings Bedded on Lime Mortar. Our lime mortar we use on site is mixed in a paddle or force action mixer. This gives the mortar the right mixing conditions, using a traditional drum mixer takes much longer to blend the mortar together. The paddle mixers forces the material together and blends quickly. There are 4 main types of lime binder using from construction mortar. Lime Putty is ideal for internal use if you are lime plastering or lime pointing. It does need to be mixed in a paddle or pan mixer as described above. NHL lime mortars have a natural hydraulic set. NHL 5 lime mortar is only really for use on the roof are of Listed Building or Period buildings. NHL 5 lime mortar can be to strong for Lime Pointing a elevation, unless the stone is very dense and does not absorb a lot of water.
restoration work on Stone Porch Listed Stone Porch restored using Lime Mortar. Lime Mortar pointing is fully breathable and allows moisture to pass through. In the Ribble Valley most builders use modern building materials. Our restoration building builder contractors use Lime Mortar for Lime Plastering and Rendering. Some of the historic building in Clitheroe and the Ribble Valley were traditionally Lime Rendered. Lime Rendering is normally applied with 3 coats then painted with up to 6 layers of Lime Wash. Lime Wash is simply lime mixed with water. The same after care is required with Lime Wash as with Lime Pointing. When the Lime render had been Lime Wash this provide a excellent breathable layer on the stonework or brickwork. The Lime Wash will need re-painting after about 3-6 years depending on exposure.
Listed Building in Lancashire restored by UK Restoration Services Listed Building Farmhouse in Bolton-by-Bowland, Clitheroe, Lancashire. Lime Mortar Pointing to gable elevation & restoration work to the Stone porch. Once the Lime Pointing on this Grade 2 listed building in Bolton-by-Bowland Nr Clitheroe in the Ribble Valley we removed the scaffolding. The lime pointing has solved the problems with water ingress in the stone wall. The damp stone wall has now dried out and does not drip water from the windows. The lime pointing has allowed all the damp to evaporate. Damp and rising damp in old listed building is normally only water penetrating through the stone or brick walls. If this water can be stopped the dampness will vanish. The listed farmhouse has now a dry and damp free stonewall.

 

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