Roof replacements, roof repairs, waterproofing

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Roofing
Roofing done on a slate tile roof

In this section we are going to be looking at doing the roofing
of one of our clients slate tile roofs. We are going to show you how
we do the waterproofing in the areas that need it, how we lay malthoid
under the slate tiles and fix them, and also how we remove the current
slate tiles that are on the roof. We will also show you pictures of roofing contractors
that previously did a patch job so that you know what to look out for if a roofing
company did work like this on your roof
Overview of the roofing project
slate tile roof view 1
slate tile roof view 2
Roofing view 1 and 2

At Ross and Son we don't believe in patch works and shortcuts. When we looked at this roof the first time we wanted to walk away and make it another roofing contractors problem. This slate tile roof had many errors and we knew it would take allot of funding from the clients side to get it fix. We could have charged the client to do minor repairs but they would only be temporal and our client would actually be loosing his money he spent because he would have to do a proper roof replacement in the end in any way.

So what was the problem? Water was leaking into the lounge area which is below the slate tile roof with the chimney, the water was leaking into the spare bedroom that is below the roof opposite the roof with the chimney and the rain water was leaking into the atrium which is below the IBR roof between both the slate tile roofs. The water could have been leaking in anywhere. This roof had so many nooks and crannies that we couldn't just take a chance. We had to do complete roof replacement. This meant the re-roofing of both slate tile roofs, the IBR roof, waterproofing around the chimney, waterproofing the parapet walls and the header walls as well. Doing this should cover all the obvious areas where the water would leak in.

Removing the old slate tiles on the roof
removing cloutnails with claw hammer

First we are going to have to remove all the old slate tiles that are on the roof before we can install the new tiles.

To do this you have to remove the clout nails with a claw hammer. They come out quite easily if they are not to long. Be carefull where you stand on the slate tiles when you pull out the clout nails You don't want to fall through the ceiling into the house.

After you've removed the clout nail from the slate tile you need to remove the copper disc rivet. This rivet sits below the slate tile between two other slate tiles upon which the one you want to remove. You can see in the next section exactly what I mean. Once you've done that you can use the slate tile ripper to remove the tile itself.

removing tiles with slate tile ripper
Example of a copper disc rivet
copper disc rivet picture

Here is an example of a copper disc rivet. It has a small round plate with a pin fixed to it.

 

 

 

 

 

The copper disc rivet is wedged between the two slate tiles in the groove and slid up to the top of the two tiles so it can be placed into the hole of the tile above these bottom two tiles.

copper dics rivet between slate tiles
copper dics rivet sliding between slate tiles in the middle

At the end of the slot you will see a small hole into which you will have to put the pin of the copper disc rivet.

 

 

 

 

 

On the left yo will see that that pin is placed in the hole of the slate tile

push copper disc rivet under slate tile and put it into the slate tile hole
hammer the copper disc rivet so it is fixed

A claw hammer can be used to bend the pin of the copper disc rivet so as to keep the roof slate tile in place.

Be careful not to hammer the rivet to hard otherwise you might damage or break the slate tile.

We sell copper disc rivets at R3 each. We only accept orders with quantities over 500. Click here and contact us to make a purchase.
 
Aluminium flashing on headwall
aluminium flashing on headerwall

The aluminium flashing on the header wall got wet leaving damp marks. Aluminium is great for waterproofing if it's done properly. It can withstand high heat temperatures, is very strong and durable and doesn't rust. If it's not installed correctly water can seep in between the joints of the aluminium sheets and cause water damage.

 

This is why we use a toch-on waterproofing system. It has all the attributes and qualities of aluminium flashings but it can be molded to melt and shape over almost any object. In the picture to the left you will see that the torch-on waterproofing was torched against the header wall at the foot of the tiles. The edge of the torch-on was heatfused over the highest brick. When water runs down the header wall it won't run underneath the torch-on waterproofing system but over it.

 

Once all the slate roof tiles has been removed make sure that all the battens is clean from clout nails. This will make the roofing process much easier as the clout nails will lift the slate roof tiles and make all the tiles uneven.

 

In the next step of our roofing project we will lay the malthoid on the battens of the roof. Malthoid is available in 2 and 3 ply thickness and comes in rolls of 900mmx20m. It's used for waterproofing.

In the picture to the left you will see that the malthoid is laid out horizontally over the battens of the roof. You'll notice that we started the roofing project from the lower part of the roof.

After you've laid the malthoid on the battens of the roof and put the slate roof tiles in place you're ready to space the tiles.

All you need to do is use a slate tile and position it in-between the two tiles you want to space. Remember to pack the first row of slate roof tiles as perfectly as you can in a row.

 

Each roof slate tile has 2 holes which is used to hammer 2 clout nails through. These two clout nails will fix the slate tile down onto the battens of the roof. The 3rd hole in the middle of the slate tile is used for the copper disc rivet as shown in the section "example of a copper disc rivet" further up on this page.

 

 

When doing a roofing project it's very important that your tiles line up perfectly from left to right on the roof. If the first row of tiles are skew the rest of the rows of tiles will also go skew.

Use a chalk line and shoot a straight line on the bottom row of tiles. Make sure that the holes of the tile to go on top of the bottom row of tiles line up with the battens. If not the second row of slate tiles won't be able to be fixed down.

Once you've made a chalk line you can start to lay the slate tiles. Notice that the roofing contractor is hammering the clout nails that is positioned in the middle of the tiles on the sides. He is also resting his hand in the middle of the slate roof tile as this is where the batten is running under the tile.

 

 

 

You will see in the picture to the left that the top row of tiles are perfectly lined up on the chalk line.

 

 

 

Malthiod is 900mm in width and covers just about two slate tiles. When you lay the malthoid make sure it rests comfortably on the battens and overlaps onto the slate tile. If this isn't done correctly the malthoid will slip off the battens and allow water to leak. If the molthoid doesn't over lap on the second row of tiles water could also leak in from the tile which will be placed on top of the second row of tiles.

torch-on waterproofing applied t headerwall
Removing the access clout nails and laying the malthoid and tiles
remove any nails from the battens of the roof
roll on malthoid and space the slate tiles

Spacing roof tiles for roofing

spacing roof tiles for roofing
fixing slate roof tiles with clout nails

Shooting a chalk line

shooting a chalk line
fixing second row of slate tiles with clout nails
lining up roof tiles for roofing project
Laying malthoid for 3rd row tiles
laying malthiod

Follow this step through until you've completed all the rows of the roofing project. After you completed the rows you can start doing to ridge capping. We will cover this procedure in the next section. All the best with your roofing project.

buy 2 ply and 3 ply malthoid

Click here and contact us to purchase 2 ply and 3 ply rolls of malthoid.

Roofing links
Roofing Article 1
Roofing Article 2
Roofing Article 3
Roofing Article 4
Roofing Article 5
Roofing Article 6
Roofing Article 7
Roofing Article 8
Roofing Article 9
Roofing Article 10
Roofing Article 11
Roofing Article 12
Roofing Article 13
Roofing Article 14
Roofing Article 15

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