APP Torch-On Waterproofing Membrane, Mineral Finish

What it is

This APP torch-on membrane is a roll of bitumen modified with atactic polypropylene (APP), made to be melted onto a roof or slab with a gas torch. On the stock roll, the upper face carries grey mineral granules, and a narrow strip along one edge is left under film instead of granules. The underside is black polyethylene film printed with the JUYONS logo. APP is not printed on the wrap: the modifier and the torch-on type come from Kitovu’s stock records.

JUYONS is the trade name of Hubei Juyons Waterproof Materials Technology Co., Ltd of Xiangyang, Hubei province, China. Its listing for SBS and APP modified membranes offers 3 mm and 4 mm rolls, 1 m × 10 m, on polyester, with a PE film or mineral top. The model number there is SBS-EL, though, and its heat and cold figures are for the SBS version.

Kitovu’s file does not yet record the thickness or roll size in stock; figures from other makers’ APP rolls are in the similar-products table, not confirmed for this item. The bitumen waterproofing membrane page compares APP and SBS rolls.

Kitovu offers the roll for foundations as well as flat roofs and terraces. On a basement wall, PMI-Plast’s data sheet sets a dimple drainage board over the waterproofing to protect it; the Dimple Drainage Membrane 8 mm with Geotextile (HDPE Drainage Board) is in stock for that layer.

Of the gallery photos, only the roll unrolled on sand shows the stock item; the rest show JUYONS packaging and a self-adhesive membrane that Kitovu does not stock.

How it is used

The Oriental Yuhong instructions for its own APP torch-on waterproofing membrane give the laying order below. Oriental Yuhong wrote them for its own roll; for the JUYONS roll they remain unconfirmed.

1. Prepare a dry, clean and smooth base with no dust, oil or loose particles; fill cracks with polymer mortar.
2. Brush primer evenly over every area the roll will cover. The Water-Based Bitumen Primer for Waterproofing Membranes, also by JUYONS, is in stock for this step; the JUYONS membrane instructions set its dose at 0.3 kg/m².
3. Heat the underside with the torch and bond the roll to the base, fully or in strips.
4. On walls, hold the top edge with metal battens and close it with a membrane sealant.

For its mineral-surfaced APP roll, SikaBit PRO P-40-0 MG, Sika allows torching at +5°C to +50°C air and base temperature with humidity up to 80%, and stores rolls upright and dry at +5°C to +35°C, for 12 months from production. These are Sika’s limits for its own roll, not confirmed for the JUYONS one. Listed market prices are on the APP membrane prices in Tanzania page.