Choosing an appropriate re-pointing mortar.
You have a few visual simple options, usually colour and texture, joint shape and size – if this is not your first time re-pointing with Lime mortars, you may just want to pick your mortar from our standard mixes, so go here to our Picture file, choose the job your doing and the mortar types most commonly used will be there.
However, if your new to this and want more help, read on –
The invisible options are performance requirements, these relate to your building, what it is built of, to large extent the detailing on the building, its location, exposure and environment, so when you need help with making the right choices, you need to have some information to hand – you will be asked.
You can supply our technical team with pictures of your building, its location and what it is being used for now, just in case you turning a water mill into a house or a barn into a bedroom – all of this can be done via email to firstname.lastname@example.org
Or you can call us on our national telephone help line 0330 303 1989
You may also wish to read on and see where we are coming from and why we try to get all the answers to ensure you get the best results.
You can pick a mortar on the basis of colour if some one is able to guide you on performance requirements. At Masons Mortar Ltd, you can ask and we will endeavour to give you our best advice as to what would be the most suitable mortar for the job your doing.
Analysis, if required, of original bedding material is usually a good first step in determining the correct materials to use in the repair of historic masonry. Mortar can and does change with time, it is better that the analysis is carried out by a suitably experienced person or laboratory.
It will not always be the case that simple matching will be sufficient. The exposure and condition of the building today may well be different from its original construction. Ruins and monuments in severe disrepair (i.e: lack of roofs, copings to wall heads etc…) might well require a repair mortar different from the original as the new mortar will have to deal with weather and exposure conditions for which the original mortar was not designed.
A classic example of this is the inside facing parapet of bridges, many solid masonry arch bridges were built in a time when horse and carts were the method of moving people and goods – now these same bridges carry cars and vans, lorries and busses, all travel significantly faster than horse and cart, all have tires, designed to throw water outwards at 90 degrees to the road surface, meaning the inside facing walls of the bridges are often saturated in even relatively short sharp showers, from tyre splash. It is clearly not sufficient to replace the mortar on the inside of a bridge parapet with what was there, is what was there has been eroded and washed out. What is required is a mortar that will deal with the traffic requirements of today, without compromising the performance of the structure in the ling term. So what seems on the face of it, best conservation practice -, REPLACE LIKE FOR LIKE, is patently not the answer.
The new mortar should be compatible with the old and should never introduce potentially damaging elements that may react negatively with that is already there or that can constitute an impermeable barrier obstructing vapour exchange and retaining moisture. The consequences in a relatively short time could be disastrous and, in most cases, irreversible. So now you know what we take the time and we hope you can see the value of reading through this section, now if you have a better understanding of what you want – go straight to our Picture file, choose the job your doing and the mortar types most commonly used will be there.
If not, call or email and we can help you one to one.