Work with your roofer to coordinate a clean dry lay down area for his material. In cold weather he will need to store his adhesives in a heated enclosure. This is his responsibility; you should have power available for him though.
The insulation needs to be kept covered at all times. It has to be dry and in good condition for installation. As insulation is being installed, check to be sure it is being adequately fastened to the deck. If not it will curl up at the edges and create air pockets under the membrane. Each manufacturer has fastening schedules for his material. A few other things to look at;
 The deck must be completely dry, trapped moisture under your roof will cause problems and possibly void any warranty
 All nailers should be in place and properly secured. Nailers should be the same height of the insulation board that abuts them. This should include any top of wall nailer to avoid unnecessary traffic on your finished roof
 All insulation boards must be butted together with gaps no larger than ¼ inch. The membrane will not bridge over it.
 On multiple layers, stagger all joints
 Some insulation boards are not meant to be stacked or layered, be sure you have the correct material
 Insulation that is cut to fit around any penetration must be neat and tight to the penetration, again gaps cannot exceed ¼ inch
 Some insulations are attached with an adhesive, make sure your roofer is using a compatible adhesive and using the specified coverage
 Butt joints should rest on the top flutes of the deck
During membrane placement, be sure that it is terminated at the end of the workday so that water does not flow beneath it. It should be sealed at flashings and edges as the work progresses. It also should be carried up the parapet wall surface and secured at the top. It’s recommended that the membrane lap over the wall. It can be trimmed of when the coping is installed.
Where overflows or scuppers are located in exterior walls, the membrane should carry through this opening until they can be trimmed out.
Roof drain assemblies should be installed as the roofing progresses.
Some installations do not cover the parapet wall or adjacent wall surface; here the flashings need to be installed as soon as possible.
Samet Corporation |
Building Structures. Building Relationships.

NOTE: The use of a “term bar” should be avoided whenever possible. Reglets and flashings are recommended
At laps in the membrane, they should be “shingled” to avoid water migrating under the lap.
Penetrations should have been coordinated during your pre installation meeting; most roofers prefer the penetrations be made after the membrane has been rolled to allow them to more easily lay out the membrane.
When these penetrations are finally made, all accessories must be on site and the roofer present to install and seal any pipe boots or pitch pockets.
Where groups of pipes such as multiple conduits penetrate the roof, be sure your electrician spaces these out so they can be properly sealed in a small curb or pitch pocket.
WALKWAY PADS
A path to equipment locations should be identified on your drawings. This is simply additional protection for the roof membrane at areas that will receive foot traffic to service roof mounted equipment. They typically are done by additional layers or pads of thicker roof membrane adhered to the roof membrane. On ballasted roofs pavers need to be used to provide uplift protection as well as a walking surface. These pavers need an additional layer of roof membrane beneath them for abrasion resistance.
Ballast Placement
Some of our roofs are ballasted. This is simply placing clean smooth river rock on the roof surface to prevent uplift. Your specification and shop drawing should indicate coverage rates in weight per square foot. This process can take up some space on your site, so you need to be ready for it. Schedule the stone delivery with your roofer so the trucks have adequate access near the building. If it is to be dumped on site it needs to be placed on a clean dry surface so the stone will not become contaminated with dirt or mud. THE STONE GOING ON THE ROOF
NEEDS TO BE KEPT CLEAN.
Samet Corporation |
Building Structures. Building Relationships.