Thin joint blockwork
31Pages

Durox System _ thin joint blockwork > from Tarmac Topblock size="-1">

Durox System is a fast-buildmethod of construction suited to all types of buildings. It is a versatile building technique and is recognised as a Modern Method of Construction. Durox System comprisesdimensionally accurate blocks, produced using the latest aircrete technology at TarmacTopblocks manufacturingfacilityin Linford, Essex. These blocks are used in conjunction with a quick-setting thin joint mortar. Thin joint blockwork has beenlong established as common practice in mainland Europe. It is recognised as one of the most efficient methods of constructing masonry, and is suitable for...

Less storage: up to 80% lessmortar materials eliminates the need for bulk sand and cement on site. Improved thermal performance: > Building with Durox System enablesthe construction process to progress quickly. This results in early occupationand therefore fasterreturn on capital investments for the developer or client. Durox System is a very flexiblemethod of construction, making it suitable for all types of buildings. It comprises Durox System blocks, which are manufactured to exacting dimensional tolerances, used in conjunction with a quick-setting, thin joint mortar. The mortar is a...

The mortar is spread on theblocks using a serrated applicator or scoop, rather than a traditional bricklayers trowel. The purpose of this tool is to lay the mortar on the bedding surface in a series of ribbons, similar to the process of applying tiling adhesive. This controls the amount of mortar, giving a consistent bed depth. This will help to ensure that the joints are fully filled and means that less levelling of individual blocks is required. The applicator is dipped into thecontainer of mortar, and then drawn along the bed face, leaving continuous ribbons of mortar across the block....

It is usually only necessary to cutblocks vertically in order to maintain the bonding at corners and around openings.To maintain the required accuracy of perpend joints, Durox System blocks should not be cut usinga hammer and bolster. The blocks should be cut square, using one of the methods described below, depending upon which is most suitable. The off-cuts from blocks should be put aside, as they can often be reused when a smaller cut is required, helping to reduce wastage.In all cases the operatives mustuse the correct personal protective equipment (PPE) when using cutting equipment. >...

These heavy-duty, versatile sawsmake light work of block cutting. The blocks should be measured and squared in the same manner as when using a hand saw. > These saws are most suited tolarge housing and commercial projects. A cutting station can be set up to undertake multiple repetitive cuts. > Hand-held rasps, block planersand sanding pads are also available to remove any high spots that may occur in the horizontal bedding face, prior to applying the mortar. Accurate laying of the blocks generally means that these tools are not needed. However, they should be considered as a useful...

As the bed joints in theblockwork do not coincide with those in the outer leaf of brickwork, conventional wall ties cannot be used with Durox System. Wall ties are available that can be face fixed into the inner leaf blocks and embedded into the brickwork in the normal way. These ties are driven directly into the blockwork, or fixed with expanding nylon anchors, as the brickwork proceeds. The wall ties are positioned at the normal centres, depending upon site conditions, i.e. 900mm centres horizontally and 450mm centres staggered vertically. At free edges, such as openings or movement...

Movement joints are formed in asimilar way to those used in conventional brick and blockwork. Stainless steel in lineӓ movement ties are inserted across the joints at every block course. The joint is filled with a suitable material. > Intersecting walls, that are not designed as a buttress, should be butt jointed and tied. This junction is often a suitable point to locate a movement joint. Lateral stability can be achieved in the same way as previously described, using an abutment movement tie, face fixed to one wall with a nylon expandinganchor, and embedded in the bed joints of the other...

Durox System is a flexibleblockwork technique that is suitable for a wide range of applications in Durox System has been extensively used for the loadbearing inner leaf of cavity walls in domestic construction. Equally, it can be used for the inner leaf in steel and concrete framed buildings. In both cases the blockwork is erected in advance of the outer leaf, resulting in the building becoming weatherproof at an early stage, allowing internal work, such as plastering and services, to progress.Durox System is not restricted touse in the inner leaf. It is suitable for use on the outer leaf...

Durox System is ideal for internalwalls in all types of buildings. It provides a strong background for fixings as well as effectively reducing sound transmission. For refurbishment work it provides a relatively lightweight and clean form of construction. Cavity separating walls in housing may be constructed from two leaves of System 600 or 700 finished with a sand/cement parging coat and plasterboard on dabs. This construction conforms to Robust Detail E-MW-7; for further details refer to the acoustic performance on page 20. Durox System 500, 600 and 700 are suitable for partitions...

Roof with ceilingU-value = 0.14 W/m > 2 KRoof window or rooflightsU-value = 1.8 W/m > 2 KWindows and doorsU-value = 1.8 W/m > 2 KExposed wallsU-value = 0.30 W/m > 2 KGas boiler with aminimum Sedbuk Of 86%Ground floorU-value = 0.20 W/m > 2 KSloping or flat roofU-value = 0.14 W/m > 2 K >

Table 13: 103mm Brickwork / 50mm clear cavity / 40mm Kingspan TW50 / System 500 block / internal finish Internal finish 299mm height 429mm height 100115125140 100115 No finish0.280.270.270.27 0.280.27 13mm dense plaster 0.280.270.260.26 0.280.27 13mm lightweight plaster 0.280.270.260.25 0.280.27 12.5mm plasterboard on dabs 0.270.260.250.25 0.270.26 > Note The lambda value of Kingspan TW50 has been taken as 0.023W/mK, resistance of low-e cavity 0.64 m 2 K/W Table 14: 103mm Brickwork / 75mm Dritherm 32 / System 500 block / internal finish Internal finish299mm height429mm height 100115125140...