SIMPLE ROOF DESIGNS AND KNOCK THROUGH INTO YOUR HOME
- Author: Scott
SIMPLE ROOF DESIGNS, MAKING WATER TIGHT AND KNOCKING THROUGH INTO YOUR EXISTING HOME.
PLANNING THE ROOF ON YOUR EXTENSION
There is a lot to think about when it comes to choosing the roof on your extension. There are many simple roof designs to choose from.
For many professionals there is only one question; is it a pitched roof or a flat roof?
You may discover, after talking to some roofers, that there are ‘strong feelings’ on the subject.
Your choice on this divisive issue might boil down to simply whether your extension is single or double storey.
SIMPLE ROOF STYLES
If your extension is a single storey, you have more leeway, than if it is double.
This is because the (dreaded by some) flat roof option is more palatable on a single storey extension.
Although the aim is still for the extension to blend in with the remainder of the house – and the street – as much as possible, there are nevertheless times when a flat roof might be the right option.
For example, if the extension is at the back and cannot be seen by the rest of the street.
Also, flat roofs are cheaper than pitched ones, which may be a consideration for some.
While most professionals would not normally advise putting a flat roof to the front of a property – and you do have an obligation to consider your neighbours’ feelings, no matter how annoying they may be – it is ultimately your money and your choice.
Most two-storey extensions have pitched roofs. This is because it would be hard, bordering on impossible, to make them blend in with the original roof otherwise.
So, unless you already have a flat roof, you will probably pick a pitched roof for your two-storey home.
SOME THINGS TO CONSIDER
Getting the extension roof tiles to match your existing roof is not always easy.
If your house is older than twenty years, even the same tile will not be identical, because of the weathering effect. If it is even older, you may struggle to find the same tiles.
One way around this is to completely re-roof the entire property when the extension goes up. This will ensure a seamless blend between the old and the new portion of the house.
Don’t rule this out just because it seems pricey. Over the years, you will probably find you replace them individually, anyway.
But ultimately, your wallet might be the one that makes the decision!
CONSTRUCTION OF THE ROOF
One reason a flat roof is cheaper and easier to construct, is due to it needing fewer materials.
This is because its surface area is smaller – maybe less than half of a pitched roof. It also weighs less.
However, there are other considerations with a flat roof; namely waterproofing.
The roof will need waterproofing with a sealer. And this is something that will need maintaining from time to time.
Be aware that leaks may form, requiring attention.
So, yes, whilst a flat roof is typically cheaper to construct than a pitched one, the maintenance could end up costing the same or more.
By and large, roofers prefer a pitched roof, for a number of reasons.
When it comes to the construction, there is a choice to be made; that of ready made, versus made to measure.
TIMBER FRAME BESPOKE CONSTRUCTION
This is the more old-fashioned option and certainly the most expensive of the two.
You may have to consider this method if your extension is an unusual shape. Additionally, if you want an empty loft, it might also be the right choice.
PREFABRICATED A FRAME
Generally, most people opt for a prefabricated roof.
This has the twin advantages of being quicker and cheaper than the made to measure version.
Firstly, the A frame goes in and then the additional timbers go on top of it.
Next, the waterproof sheeting goes on and the battens for the slates are placed. Remember to leave enough ventilation at the eaves, to prevent condensation from building up.
It will need to be approved by Building Control. But also, it needs to withstand the might of the British weather!
THE BUILDING INSPECTION
Yes, your roof needs inspecting and this has to be done before it is covered.
Allow time in your schedule to book the inspector’s visit at a convenient moment. You don’t want to have to stop work because you forgot to arrange it in time.
THE KNOCK THROUGH
Having organised Building Control, you are now at the exciting moment of knocking through into the original building
But, before you even dream of removing a single brick, the wall needs to be supported properly.
The knock through should go something like this;
Drill a hole as near to the ceiling as you can get and place the timber or steel needles there. These should stick out by eighteen inches on both sides of the wall.
These needles should be placed every two feet across the width of the planned opening.
TIMBER HEAD TREES
Now the needles are in place, a strong timber should go at each side of the wall.
This is known as a head tree. They’re held in place by a prop, which can be hired out. One prop should be used at the end of every needle.
CUTTING MASONRY AND LINTEL
A lintel can be cut, when the support is in safely. It should be twelve inches wider than the opening or 150mm each side at least.
REBUILDING THE MASONRY
Now the hole is there, the masonry around the lintel can be (carefully) rebuilt. It might need some patching in, to ensure there are no gaps remaining.
THE NEW OPENING
After the cement around the lintel has hardened, the needles and props can come out.
Finally, the new hole can be cut leaving an opening to fit your new door way into your house.
Read the next part of our guide on self building your home extension… or find out more information on how to hire us on our home page