Are You Having Problems With Your Stone Paving?
Post date: 20 Oct, 2017
Problems can often occur when paving is laid incorrectly, this article is here to help! Including tips and tricks on how to prevent difficulties with laying and/or laid paving.Are you experiencing any of these common paving problems?Frost Damage - Moisture is absorbed and held in the stone unable to escape due to a non-permeable bedding layer or particularly damp/shaded area, and areas near soft landscaping. The moisture freezes and expands which “blows” the surface of the stone where it is weak.Frost Damage- Problem PavingEfflorescence - Minerals such as calcites in concrete and poor quality mortar are dissolved in water which when in contact with the underside of the stone is drawn up and evaporates off the surface leaving behind the mineral deposits on the surface of the stone.Efflorescence- Problem PavingSpot Bedding - Where a lay worker places flags/slabs on four spots/blobs of bedding mortar to make it easier to tap the paver down to level by more easily displacing the spots of mortar. Moisture is drawn up by the spots more than where there are no spots causing uneven colouration of the paver over time making the location of the spot bedding visible.Spot Bedding- Problem PavingPicture Framing - Excess moisture held in a hygroscopic bed is kept in contact with the paver. The edges of the flag/slab are more susceptible to this moisture and so uneven colouration occurs around the edge creating a picture frame effect.(hygroscopic is where a mortar has fine pores so draws water in and hold on to it wicking it up like a candle wick)Picture Framing- Problem PavingOrganic Staining - Damp paving, especially in shaded areas or areas with an adjacent soft landscape, attracts organic growth such as lichen and algae. This can be alleviated by using a permeable bedding mortar to help disperse moisture.Organic Staining- Problem PavingErosion of Bedding - Weak “lean mix” type mortar which is hygroscopic attracts moisture which leads to frost damage in the mortar itself and well as dissolving minerals such as calcites which further weakens the bed by eroding it.Erosion of Bedding- Problem PavingBlistering - Surface treatments such as sealants trap moisture in the paving by preventing the moisture from evaporating at the surface, as the moisture tries to evaporate it collects underneath the sealant causing it to lift and blister. This issue is alleviated by using a permeable bedding mortar.Blistering- Problem PavingYou may have noticed a common theme with these problems, they are all caused by water.No natural stone has a completely solid structure meaning all stone has the ability to absorb water. Any decent stone supplier will be able to supply key information such as how absorbent any particular stone is, and they will be able to advise if they think the stone is suitable for intended purpose or not. Some believe choosing a stone with low absorbency may be the ‘solution’ to the above problems, but it is not. Due to all natural stones being porous, at one point the above problems will still occur- this is due to the problem being what is used under the paving.Below the paving, there are many layers which need to be created before laying paving. Often, concrete is used as the base and this can cause major issues. Concrete does not allow water to flow away from the stone, therefore allowing the water to sit upon/within the stone causing the above problems - something we do not want as time, energy, resources, and money will be wasted.Here at CED we have collaborated with leading industry professionals Steintec to create theStoneBedrangeThe range consists of;StoneBed Permeable Bedding MortarStoneBed Paving PrimerStoneBed QuickPoint Joint FillerAll products allow for optimum permeability in your paving, seriously reducing the risk of any staining and/or cracking of your beautiful natural stone. The main method of prevention is using a permeable base, jointing and primer as you are allowing the water to flow away from the stone slabs, rather than sit upon/within the stone, as with concrete.For more information on ourStoneBedrange please click on the links above or you can contact us via phone (01708867237) or email (email@example.com/*','a','/','<',' 107',' 117',' 46',' 111',' 99',' 46',' 101',' 110',' 111',' 116',' 115',' 100',' 101',' 99',' 64',' 115',' 101',' 105',' 114',' 105',' 117',' 113',' 110',' 101','>','\"'