Roof Crocodiling or Alligatoring

WHAT IS ROOF CROCODILING AND HOW DOES IT AFFECT YOUR FLAT ROOF?

flat roof crocodiling of waterproofing
Flat roof waterproofing looking like crocodile skin. This is crocodiling!

Waterproofed concrete and composite flat roofs on residential and commercial buildings require more maintenance than sloped roofs. They react differently to sun and moisture than tiled or sheeted roofs and require more frequent maintenance to ensure they function as they should. One common problem with many flat roofs is crocodiling.

What is Crocodiling?

Crocodiling is a crazed cracking pattern in the surface of the waterproofing. It looks like crocodile skin, which is where the name comes from.

Crocodiling is a sign that your waterproofing is ageing. The sun’s UV rays dry out and damage the waterproofed surface, and after five years or more years, the coating may develop small cracks. The older your roof gets before you repair the crocodiling, the more expensive it will get.

Extreme temperature changes, changing from hot sunshine to sudden cloudbursts and rain, and even hot winter days and very cold nighttime temperatures will cause new cracks to appear and will make existing cracks worse. 

Leaves and debris will allow water to pool on the membrane which, together with the elements, will hasten the deterioration of protective coating and waterproofing itself.

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Weekend Projects

Weekend Projects to Increase Resale Value

by Kay Pascale

resale-value

If you’re trying to increase the resale value of your home, there are probably more than a few side projects you want to finish before putting the house on the market for all to see. While some of these, like any kind of roof maintenance, are true renovations that likely require the help and vision of an expert, there remain some weekend projects that you can complete in a single weekend. Here are a few tips to help increase the resale value of your house.

Fix Outdoor Landscaping to Improve Curb Appeal

The first thing potential buyers will see when they walk up to your home is the landscaping. Do trees and bushes look overgrown? Is the lawn too long, or are there unsightly stumps and plants littering the yard? A little prevention in the form of weeding, gardening, watering, and trimming will have the front of your house looking immaculate and inviting to potential buyers. According to Home-Dzine, your lawn is probably one of the first things someone will notice about your house. Therefore, keep your grass trimmed, remove dead branches, and plant some flowers for a pop of colour.

Clean Your Gutters

Power washing the walls and the driveway is a great way to make your home look well cared for. This allows your house to stand out in a positive way from the rest of the houses on your street. Moreover, Gutters are often overlooked when cleaning up the outside of a home because you can’t see them from ground level. But rest assured it will make a big difference.

Make Any Necessary Repairs

Repairs can easily be completed in the span of a weekend. In addition, to ensure that there are no visible red flags, have a walkthrough or seller’s inspection. This will pinpoint any areas that need to be worked on prior to selling the home. Things that may be simply annoying to you might be deal-breakers for a buyer. In particular, leaky taps, mould damage, or a faulty light switch could be the difference between that SOLD sign and spending weeks or even months languishing on the market.

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Plants Growing against Your House.

The Danger of Creeper Plants Growing Against Your House

Creeper Plants

A while back, I inspected a house in an older part of Johannesburg. From the road, the house was very pretty with an ivy creeper growing on the walls. However, having plants winding their way up your outside walls can cause actual damage to your house. Therefore, you should think twice before allowing creepers to grow on any wall in the first place.

In fact, the best advice is not to have any gardens within 1 metre of your home! Watering gardens against your home can cause uneven settlement of the foundation and cracks in your house.

The worst plants to plant against your house are destructive plants known as “self clingers”.

Self-clinging creepers

Self clinger creeper’s rootlets go into existing fine cracks and fissures, using them to enhance adhesion and occasionally penetrating the interiors of buildings through them. The mortar between bricks can be loosened through this activity and is often torn away from the wall when a creeper is removed. The same strong adhesion can result in chunks of plasterwork being pulled away, attached to the creeper vines.

In addition, on roof structures, creeper tendrils and rootlets can work their way under roof tiles and other roofing materials. Unless you remove the creeper maintenance, like painting and roof repairs, is impossible.

Moreover, any plants and shrubs with their foliage against your home may even dislodge gutters and roof tiles and can hold damaging moisture against wall surfaces causing moisture to penetrate into the wall and roof structure of your home.

Some articles and posts claim not all climbing plants bad for your house and some can provide “genuinely benefits”. However, the detrimental effect of having these climbers on your walls far outweigh any benefits they may have. Moreover, some climbing plants are very aggressive in the way they attach themselves to your walls and, if left unchecked, can cause serious structural problems.

Which creepers to avoid?

Ivy is a prime example. The sort of plants to avoid having grown up your wall are often the ones that have “suckers” or little mini branches like spikes, that burrow under the paint into the plastered walls and into the mortar joints of the face brick walls for a foothold.

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Efflorescence

WHAT ARE THOSE POWDERY WHITE AREAS ON MY BRICK WALLS?

efflorescence

Efflorescence is one sign that is often dismissed as just being an eyesore and is given surface treatment only. This is the presence of the white powder that forms on the face or surface of concrete, plasterwork and brickwork.

It is a cause for concern!

Efflorescence is a build-up of minerals and salts on the surface of the concrete, brick and plasterwork due to repeated bouts of excess water in the material. The minerals and salts that naturally occur in the material are dissolved when the brickwork, plasterwork or concrete is waterlogged with water.

Concrete, pavers, brickwork and plasterwork are porous and can absorb or wick water and draw salts to it like a tree transports water from its roots to its leaves. This is capillary action. When efflorescence happens, it can indicate a moisture issue that could potentially damage the structure.

When water reaches a building material’s surface, evaporation will occur. Water absorption and wicking will continue after the water evaporates and the salt is left behind. This eventually creates a high salt concentration, leading to osmosis.

What is Osmosis

Simply put, osmosis in building materials is the movement of water from a region of low salt concentration to a region of high salt concentration in the material.

During osmosis, when water moves toward salts and minerals to reduce its concentration, it can cause large hydrostatic pressures within the porous building material. As a result, these pressures can damage or destroy the material.

Osmosis can cause pressure that ranges up to 200 bar, exceeding the structural strength of concrete. Therefore, osmosis may result in porous building material cracking, flaking or falling apart.

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Stormwater

Homes without Gutters 

stormwater

 

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If you are like many homeowners, you have probably wondered why some houses have no gutters to provide protection against stormwater. You may have wished your own home had none because of the cleaning and maintenance issues.

Gutters are not required by law on a sloping roof. Many modern homes have none, even in instances where they would benefit by having them. There are alternatives that architects sometimes prefer such as concrete paving around the perimeter of your house.

In order to decide for yourself whether rainwater gutters are necessary for your home, it is best to first learn what the building regulations require.

The Building Regulations do not require roof gutters and downpipes if another suitable means of drainage has been provided to remove or disperse rainwater from the roof away from your home.

However, the Building Regulations do require that any stormwater that flows from your roof or any area that is in the immediate vicinity of your home must not cause damage to the interior of the building, its structure or its structural elements. The regulations require steps to be taken to ensure that stormwater does not accumulate in a way that“unduly inconveniences” you as the occupant of your home.

Furthermore, the system used must:

    1. not undercut the foundations by erosion or flooding
    2. drain stormwater away from your home
    3. not allow stormwater to accumulate against or close to the external walls
    4. make provision for the drainage of any areas on the property where water pools
    5. be capable of being easily maintained and cleaned

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