Posts Tagged ‘deck’

JUNE Social Media Post Roundup

๐Ÿ”นLarge Deck Over an Underground Car Park:

๐Ÿ” ๐—ฆ๐—ถ๐˜๐—ฒ ๐—ฆ๐˜‚๐—ฟ๐˜ƒ๐—ฒ๐˜† & ๐—ช๐—ฎ๐˜๐—ฒ๐—ฟ๐—ฝ๐—ฟ๐—ผ๐—ผ๐—ณ๐—ถ๐—ป๐—ด ๐—”๐˜€๐˜€๐—ฒ๐˜€๐˜€๐—บ๐—ฒ๐—ป๐˜
Our experienced surveyor recently visitedย this Bournemouth, mid-1970s purpose-built apartment complex comprising two 7-storey towers with a shared basement car park, to carry out a comprehensive inspection following reports of water ingress.
๐Ÿ’งย ๐—œ๐˜€๐˜€๐˜‚๐—ฒ ๐—œ๐—ฑ๐—ฒ๐—ป๐˜๐—ถ๐—ณ๐—ถ๐—ฒ๐—ฑ:
Water penetration was observed through the roof slab of the basement car park. The original deck was constructed using asphalt membranes, which are known to degrade under prolonged UV exposure. Over time, thermal expansion and contraction can lead to fatigue and crackingโ€”especially at high-stress areas such as corners, structural junctions, and upstand details.

Ocean heights Deck

๐Ÿ”Žย ๐—ž๐—ฒ๐˜† ๐—œ๐—ป๐˜€๐—ถ๐—ด๐—ต๐˜:
Itโ€™s important to note that visible leaks on the underside of a concrete slab donโ€™t always indicate the exact point of water entry. Water can migrate through construction joints, and movement joints before becoming visible below.
๐Ÿ—๏ธย ๐—ฆ๐˜๐—ฟ๐˜‚๐—ฐ๐˜๐˜‚๐—ฟ๐—ฎ๐—น ๐—ข๐˜ƒ๐—ฒ๐—ฟ๐˜ƒ๐—ถ๐—ฒ๐˜„:
The basement structure consists of reinforced concrete downstand beams supporting a 150mm thick slab. The ground-bearing slab includes perimeter edge thickenings and reinforced concrete walls to retain surrounding ground levels. Our inspection also highlighted the need for upstand and concrete repairs in several areas.
Weโ€™re now working closely with the client to develop a robust waterproofing solution tailored to the unique challenges of this buried deck system.


 

๐Ÿ”นSemi-Basement Extension, Salisbury: Following our pre-construction waterproofing survey, our technicians are now on site installing aย ๐—ง๐˜†๐—ฝ๐—ฒ ๐—– ๐—ฐ๐—ฎ๐˜ƒ๐—ถ๐˜๐˜† ๐—ฑ๐—ฟ๐—ฎ๐—ถ๐—ป ๐—บ๐—ฒ๐—บ๐—ฏ๐—ฟ๐—ฎ๐—ป๐—ฒ ๐˜€๐˜†๐˜€๐˜๐—ฒ๐—บย to protect the newly built semi-basement extension at thisย ๐—š๐—ฟ๐—ฎ๐—ฑ๐—ฒ ๐—œ๐—œ ๐—น๐—ถ๐˜€๐˜๐—ฒ๐—ฑย property in Salisbury.
Although not a full basement, the structure still requires effective protection against water ingress to ensure it remains dry and habitableโ€”fully compliant withย ๐—•๐—ฆ ๐Ÿด๐Ÿญ๐Ÿฌ๐Ÿฎ:๐Ÿฎ๐Ÿฌ๐Ÿฎ๐Ÿฎย standards for below-ground waterproofing.

๐Ÿ’งย ๐——๐—ฟ๐—ฎ๐—ถ๐—ป๐—ฎ๐—ด๐—ฒ ๐—ฆ๐˜๐—ฟ๐—ฎ๐˜๐—ฒ๐—ด๐˜† โ€“ Gravity-Fed System:
As part of our design, we offered the option of aย sump and pump systemย to manage any potential water ingress. However, the client opted for aย gravity-fed drainage solution, which is a passive system that relies on natural fall to direct water away from the structure.

nunton House

This approach involves:
โœ… ๐——๐—ฟ๐—ฎ๐—ถ๐—ป๐—ฎ๐—ด๐—ฒ ๐—ฐ๐—ต๐—ฎ๐—ป๐—ป๐—ฒ๐—น๐˜€ย integrated at the base of the cavity membrane system.
โœ… ๐—ฃ๐—ถ๐—ฝ๐—ฒ๐˜„๐—ผ๐—ฟ๐—ธ ๐—ฐ๐—ฎ๐˜€๐˜ ๐—ถ๐—ป๐˜๐—ผ ๐˜๐—ต๐—ฒ ๐˜€๐—น๐—ฎ๐—ฏย designed with sufficient fall to ensure continuous flow.
โœ… ๐—” ๐—ป๐—ผ๐—ป-๐—ฟ๐—ฒ๐˜๐˜‚๐—ฟ๐—ป ๐˜ƒ๐—ฎ๐—น๐˜ƒ๐—ฒย fitted to prevent any risk of backflow from the external surface water system.

Gravity-fed systems are highly effective where site levels allow, offering a low-maintenance, energy-free solution for managing groundwater ingress.
Weโ€™re proud to support projects that combine modern construction with heritage sensitivityโ€”delivering long-term protection and peace of mind.


 

๐Ÿ”นCambridge House Walkthrough Video

๐ŸŽฅย Take a behind-the-scenes look at our installation work on the prestigious Cambridge House renovation project!

This video captures just a glimpse of the scale and complexity involved in transforming this iconic London landmark into a luxury 5-star hotel. With multiple phases and intricate detailing, itโ€™s a project that demands precision, expertise, and collaborationโ€”and weโ€™re incredibly proud to be part of it.

From heritage preservation to cutting-edge waterproofing solutions, our team has been working closely with contractors and consultants to ensure the highest standards are met at every stage.

New build with Deck

๐ŸŒŸย Exciting Project in Poole, Dorset!ย ๐ŸŒŸ

We're thrilled to be collaborating with our existing clients on a fantastic new project in Poole, Dorset. Our team has successfully installed our state-of-the-art cavity drain system in two stunning new build houses. Now, we're focusing on the deck area to ensure it meets the highest standards of waterproofing.

These houses are uniquely set into the ground, featuring a shared retaining wall at the back. The structure above the Lower Ground Floor is designed with an over-deck, necessitating a robust waterproofing solution under the patio. Our expert technicians are on the job, ensuring every detail is meticulously handled to prevent any water ingress and maintain the integrity of the build.

Stay tuned for more updates as we progress on this exciting project! ๐Ÿก๐Ÿ’ง๐Ÿ”ง

9 Partridge walk Deck
maclennan waterproofing spray

Deck hunting season is open!

The MacLennan staff are starting to emerge from the basements, blinking in the sunlight and preparing to work on decks. Winter work on basement decks is at best difficult and at worst, carried out incorrectly in poor conditions.

Sprayed and hand applied liquid Waterproof systems should never be applied on damp decks. They should never be applied when the ambient temperature is not at least 3 degrees above the dew point, even if the sun is out. We rely on bond to resist outgassing.

This applies to most forms of waterproofing on decks and around basements. Even the sheet membranes normally have a primer which relies on the dry warm conditions for installation.

Planning a basement.

If you are planning a basement you should be sequencing the work so as the critical deck and external waterproofing is carried out in the spring, summer and early Autumn.

If the work has to be carried out in the winter then you have to cost in Winter primers, tenting, frost blankets, installing and removing covers, drying of surfaces and downtime when work just cannot happen unless fully tented and heated.

All of this preparation is very rarely considered even when set out in supporting information and data sheets supplied by contractors and manufacturers.

This is all critical.

If you allow or worse force the work to happen in inappropriate weather and environmental conditions you will have failures.You cannot apply waterproofing the day after rain, you need at least a good days drying after the water has been cleared off of the deck.

Winter Deck & Roof Waterproofing Problems

Like all waterproofing and roofing contractors MacLennanย have a tough time trying to apply waterproofing systems in Winter conditions.

Note to contractors, clients and project managers. If you are planning a roof or deck then do it in the spring / summer and hope it doesnโ€™t rain.

All waterproofing and flat roofing systems require reasonable weather.

A responsible contractor will not even attempt to install if the temperature is below 5 degrees or if it is not 3 degrees above dew point. Relationships may be strained by a lack of progress on site, and then on the first day of reasonable weather every project manager will expect that they are next on the list for attendance, when in all likelihood a good busy contractor, will have a number of delayed projects and all for important , demanding clients who are desperate to complete their work and get there building dry. This is a problem shared by the whole industry, which leads to bigger problems when waterproofing contractors carry out installations in inclement conditions to keep the client happy, and then have a failure / leak as a result.

If you must programme work for Winter months remember the cost of a leak will be far more than the cost of a delay.

IMG_0587

The golden rules are that work must not proceed unless :

  • Temperature 5 and rising Temperature 3 above dew point, no damp on surfaces.
  • Generally it is not possible to apply adhesives, primers, coatings for at least 24 hours after rain. It can appear dry and sunny but the dew point can still be very high in conditions of high relative humidity.

Remember if the contractor is not installing he is not earning, so he is just as motivated as you are.

MacLennan do have cement based systems for wet decks but not cold and Polyurethane systems for application when quite cold but not wet. Nobody has a system for cold and wet decks.

Get in touch!

Ready to start a project or require more information about us?
Call us about your project or problem and we will be happy to help.


Call us today on:

0330 3200 240
Or email us here