Mouldy silicone in my shower, how can I fix it? Let’s talk about silicone and the role it plays in your home.

Mouldy silicone is not the fault of the installer or the manufacturer and really not you, because the silicone will generally mould in an area that is close to moisture.It’s there to provide a seal that flexes with movement and hangs in there when things are tough….

The shower is the main offender where mouldy silicone is found because the shower is an enclosure where there is heat, moisture and soap from shampoos and bars.
In most cases along with what we wash off ourselves, mould occurs just like a bacterial evolution, manufacturers do not guarantee the silicone against mould or any other discoloration for that matter. As I said above it is not really your fault because you don’t even know what causes the mould in the first place but if you did you would certainly try and prevent it….. wouldn’t you?
What other areas are there that can get mouldy?
One place that comes to mind is a bath, it’s a place where the kids play and splash but the water sits comfortably on the surrounding surface while the silicone is waiting for someone to dry it but it doesn’t happen so it dries up and leaves soap residue. Again it’s the soap residue that is a precursor to the mould, but lets not forget the basin or the sink and I can almost see a hand pump of liquid soap sitting by the basin while your washing hands together under the water splashing soapy water around the basin not drying up or cleaning it and  leaving it for somebody else, again this is where the mould starts.

So how can I fix it since I now know how mould starts?

CUT IT OUT, the offending silicone needs to be removed and reapplied, by leaving it black it only gets worse and slowly borrows its way through to the rear of the silicone bead. In some cases the silicone moulds from the rear and drives through to the front, be cautioned that once the mould is in the silicone it stays in the silicone until you or a professional deals with it.

Call or email us if you need a professional to help out


Matt Tucker



Construction Waterproofing

In construction a building or structure is waterproofed with the use of membranes,

and coatings to protect contents as well as protecting structural integrity. The waterproofing of the building envelope in construction specifications is listed under “07 – Thermal and Moisture Protection” within MasterFormat 2004, by the Construction Specifications Institute, and includes roofing material as well as waterproofing materials.
In building construction, waterproofing is a fundamental aspect of creating a building envelope, which is a controlled environment. The roof covering materials, siding, foundations, and all of the various penetrations through these surfaces need to be water-resistant and sometimes waterproof. Roofing materials are generally designed to be water-resistant and shed water from a sloping roof, but in some conditions, such as ice damming and on flat roofs, the roofing must be waterproof. Many types of waterproof membrane systems are available, including felt paper or tar paper with asphalt or tar to make a built-up roof, other bituminous waterproofing, EPDM rubber, hypalon, polyvinyl chloride, liquid roofing, and more.
Walls are not subjected to standing water, and the water-resistant membranes used as housewraps are designed to be breathable to let moisture escape. Walls also have vapour barriers or air barriers. Damp proofing is another aspect of waterproofing. Masonry walls are built with a damp-proof course to prevent rising damp, and the concrete in foundations needs to be damp-proofed or waterproofed with a liquid coating, basement waterproofing membrane (even under the concrete slab floor where polyethylene sheeting is commonly used), or an additive to the concrete. A potential problem in earth sheltered houses is too much humidity, so waterproofing is critical in these houses. Water seepage can lead to mould growth causing significant damage and air quality issues. Properly waterproofing foundation walls is required to prevent deterioration and seepage.
Another specialized area of waterproofing is roof top decks and balconies. Waterproofing systems have become quite sophisticated and are a very specialized area. Failed waterproof decks and failed waterproof tile decks are one of the leading causes of water damage to building structures, as well as personal injury when they fail. Where major problems occur in the construction industry is when improper products are used for the wrong application. While the term “waterproof” is used for many products, each of them has a very specific area of application, and when manufacturer specifications and installation procedures are not followed, the consequences can be severe. Another factor, is the impact of expansion and contraction on waterproofing systems for decks. Decks constantly move the changes in temperatures, putting stress on the waterproofing systems. One of the leading causes of waterproof deck system failures, is the movement of underlying substrates (plywood) that cause too much stress on the membranes resulting in a failure of the system. While beyond the scope of this reference document, waterproofing of decks and balconies is a complex compliment of many complimentary elements. These include the waterproofing membrane used, adequate slope/drainage, proper flashing details, and proper construction materials.
The penetrations through a building envelope need to be built in a way such that water does not enter the building, such as using flashing and special fittings for pipes, vents, wires, etc. Some caulkings are durable, but many are not a reliable method of waterproofing.
Also, many types of geo-membranes are available to control water, gases, or pollution.
Over the past two decades, the construction industry has had technological advances in waterproofing materials, including integral waterproofing systems as well as more advanced membrane materials. Integral systems such as hycrete work within the matrix of a concrete structure, giving the concrete itself a waterproof quality. There are two main types of integral waterproofing systems: the hydro-philic and the hydrophobic systems. A hydro-philic system typically uses a crystallisation technology that replaces the water in the concrete with insoluble crystals. Various brands available in the market claim similar properties, but not all can react with a wide range of cement hydration by-products and thus require caution. Hydrophobic systems use fatty acids to block pores within the concrete, preventing water passage.
Sometimes the same materials to keep water out of buildings are used to keep water in, such as pond or pool liners.
New membrane materials seek to overcome shortcomings in older methods like PVC and HDPE. Generally, new technology in waterproof membranes relies on polymer-based materials that are extremely adhesive to create a seamless barrier around the outside of a structure.
Waterproofing should not be confused with roofing since roofing cannot necessarily withstand hydrostatic head while waterproofing can.

The standards for waterproofing bathrooms in domestic construction have improved

over the years, due in large part to the general tightening of building codes.


This post was originally found on and was added to  for additional information.