Chapter 2: Technical Datasheets, Application Matrix and Quality Testing

Chapter one of the encyclopedia covers the physics of heat and moisture transfer and advanced materials. This chapter moves from theory to the document engineers and buyers actually rely on: the technical data sheet (TDS). The aim is threefold: to understand what the numbers mean and how to read them, to have a corrected reference table for eight materials common in insulation and protection projects, and to link material choice to facility type and then verify workmanship through documented tests.

How to Read a Technical Datasheet Like an Engineer

The most common mistake when comparing bids is placing two numbers from two different data sheets side by side without asking: Which standard was this measured to? Under what conditions? Is it an average or a minimum? A datasheet number is not an absolute property of the material; it is the result of a specific test on a specific specimen. Four elements govern the meaning of any figure.

1. The test standard: a number without a standard means nothing

Every property should carry the code of the standard used to measure it, such as ASTM C518 for thermal conductivity or ASTM D1621 for compressive strength. Different standards for the same property can give results that are not directly comparable. A clear example: ASTM D412 for tension testing of rubber and elastomers states that its Methods A and B «do not produce identical results», and ASTM E96 for water vapour transmission states that the desiccant and water methods are not directly comparable. So when comparing two materials, first confirm that the standard and the sub-method are the same.

2. Typical values versus guaranteed minimums

Data sheets usually quote «typical values»: laboratory averages that are not a contractual commitment. Some data sheets state explicitly that values are «based on system processing under laboratory conditions» and that field results may vary. By contrast, material specifications such as ASTM C578 for polystyrene set a minimum for each type (for example minimum density and minimum compressive strength). When writing a project specification, ask for the minimum or a range with its tolerance (such as 3000 ± 200 psi) rather than a single typical value.

3. Conditioning and test conditions

Polymer properties are sensitive to temperature, humidity and loading rate. ASTM D638 for tensile testing of plastics stresses that tensile properties «vary with specimen preparation and with speed and environment of testing». Likewise, ASTM D2842 determines water absorption of rigid cellular plastics by immersion under a 5.1 cm head of water for 96 hours, so a data sheet quoting absorption after 24 hours is measuring something different. Always read the footnote giving temperature, specimen age and curing time (for example «7 days at +23 °C»).

4. Initial versus aged thermal conductivity

In closed-cell foams such as polyurethane, thermal resistance drops over time as the blowing agent in the cells gradually exchanges with air. Good data sheets therefore quote an aged value, for example «R-value at 180 days per ASTM C518», with a note that the value «will vary with age and use conditions». Design must use the aged value, not the initial value measured just after production.

5. Questions a datasheet must answer before approval

Master Reference Table for the Eight Materials

The table below brings together typical ranges for eight materials from sources we opened and checked. Where a circulating value was inaccurate we corrected it, and where a property does not apply we entered «—». Note that each range spans several products; any single product has one value in its own data sheet.

The second table links each property to its governing standard. Use it when reviewing a data sheet or writing a specification: if a data sheet quotes a property under a different standard, ask why and whether the values can be compared.

Material Profiles: Composition, Application and Cautions

Each material below has a short profile that complements the table: what it is made of, how it is applied and what ruins it on site. For full details see the material page in the materials guide where one exists.

Pure polyurea

Composition: the reaction product of an isocyanate component with an amine blend, curing within seconds into a continuous, flexible, seamless membrane. Application: sprayed with heated high-pressure plural-component equipment at a 1:1 ratio; data sheets state hose and block temperatures (for example 60–70 °C). Cautions: the fast reaction does not forgive poor surface preparation; moisture in concrete causes blistering and delamination, so a suitable primer and moisture testing are required. Wet service limits are far narrower than dry ones (one data sheet gives 4–49 °C wet versus −40 to +121 °C dry). Aromatic grades discolour under UV and need a topcoat. More detail on the polyurea page in the materials guide.

Spray polyurethane foam

Composition: a rigid closed-cell foam formed by reacting a polyol and an isocyanate with a blowing agent; it expands in place and bonds to the substrate. Application: sprayed in successive passes with a maximum thickness per pass set by the data sheet, then covered with a protective layer; roofing foam is usually classified to ASTM C1029 Type III, which requires a minimum compressive strength of 40 psi (about 276 kPa). Cautions: exposed foam degrades quickly in sunlight, and design must use the aged conductivity. It is combustible and needs a thermal barrier or protective coating per code. See the polyurethane foam profile.

Extruded polystyrene (XPS)

Composition: extruded polystyrene with a uniform closed-cell structure and a smooth skin. Application: boards laid over the waterproofing in inverted roofs, under slabs and against foundation walls. Choose the grade by load: ASTM C578 defines types from 104 to 690 kPa. Cautions: the maximum service temperature is about 74 °C, so it must not sit under exposed dark layers or near heat sources. It is attacked by organic solvents found in some adhesives and solvent-borne bituminous coatings, so check chemical compatibility. It is combustible and needs protection.

Stone wool

Composition: mineral fibres spun from molten volcanic rock with a binder, an open structure that lets vapour pass. Application: high-density boards for roofs and facades, and blankets and rolls for pipework and industrial equipment. Cautions: its thermal resistance falls if it gets wet, so it needs protection from water and a vapour barrier on the warm side where required. Compressive strength of roof boards is relatively low (30–80 kPa at 10%) compared with rigid foams, so it is unsuitable under concentrated traffic loads without a load-spreading layer. Its great advantage is the A1 non-combustible classification. See the stone wool page.

Aerogel blankets

Composition: nanoporous silica carried in a fibre batting, trapping air in pores smaller than the mean free path of its molecules. Application: wrapped around pipes and equipment, or used as thin layers to treat thermal bridges where space is limited. Cautions: cost per square metre is high, and cutting releases dust that calls for protective equipment. Temperature limits differ radically between building products (about 200 °C) and industrial products (up to 650 °C), and conductivity rises with temperature (industrial example: 0.020 at 0 °C versus 0.046 at 400 °C).

Floor epoxy with hygiene certification

Composition: a two-component epoxy resin with an amine hardener, applied as a coating, self-levelling screed or sand-filled mortar. Application: on mechanically prepared, dry concrete, with a primer, then body coat and topcoat. Cautions: «food grade» is not a physical property but a certificate: look for a specific conformity certificate (examples in data sheets: an ISEGA certificate for food contact on Sikafloor-264, and BS 6920 conformity for potable-water contact on Sikagard-62). Permanent dry service temperature is only about 50 °C, so steam cleaning or boiling-water washdown may need another system such as polyurethane cement. System details are on the epoxy page.

Borated polyethylene

Composition: polyethylene loaded with boron compounds; the hydrogen in the polymer slows neutrons and the boron absorbs them. Common boron contents are 1–5% by weight, with grades up to 30% for special applications. Application: sheets cut and mechanically fixed in rooms needing neutron shielding, within a design prepared by a specialist. Cautions: it is neither a thermal nor a waterproofing material, its continuous service temperature is about 80 °C, and it is combustible. Using it is a radiation-design decision, not an insulation contractor's decision.

Lead sheet

Composition: a very dense metal (about 11,340 kg/m³) with low tensile strength (12–17 MPa) and a yield stress of about 5.5 MPa, meaning it creeps and sags under its own weight. Application: sheets bonded to gypsum or timber boards or built into doors and frames, with overlaps at joints. Cautions: lead is toxic; cutting, sanding and soldering require occupational health controls. Because it is weak it must be supported by a backing layer, never hung free. Lead thickness is set by radiation shielding calculations, not by the contractor.

Facility Specification Matrix

A good material in the wrong place fails. The matrix below links facility type to the governing requirement, candidate materials and common failure points, followed by detail for each category.

Residential and commercial buildings: roofs

In a conventional roof the thermal insulation sits below the waterproofing membrane, so the membrane is directly exposed to heat, UV and the large daily temperature swings of Saudi Arabia. In an inverted roof the membrane is laid directly on the slab and topped with low-absorption closed-cell XPS boards, then a separating geotextile that keeps fines out of the joints, then gravel or pavers. The advantage of the inverted roof is that the membrane is protected from heat, UV and mechanical damage. In both cases the falls must be formed with a screed to falls towards the drains before insulating, because standing water accelerates the ageing of any membrane. For practical detail see bituminous membranes and acrylic roof coatings.

Residential and commercial buildings: basements and tanking

Basement tanking means wrapping the buried structure in a continuous waterproofing layer. Positive-side application (the soil and water side) is preferred because water pressure pushes the membrane against the concrete. Negative-side application (from inside) is used for remediation when excavation is not possible, and suits materials that work within the concrete pores, such as crystalline waterproofing, or cementitious systems designed to resist negative pressure. In new buildings with confined excavations retained by shoring walls, pre-applied membranes are fixed before the concrete is poured and bond to it as it cures.

Industrial facilities and cold stores (−25 to −40 °C)

• Vapour barrier on the warm side: vapour pressure in hot, humid outdoor air is much higher than inside a freezer room, so vapour drives inward. The vapour barrier goes on the warm, outer side of the insulation, and any breach lets vapour condense and freeze within the insulation, progressively destroying its thermal value.
• Avoid thermal bridges: columns, beams and metal fasteners penetrating the insulation become points of condensation and ice. They must be thermally broken or wrapped over a sufficient length, and wall-to-floor and wall-to-roof junctions need special care.
• Floor insulation: use boards of high compressive strength such as XPS or PIR, choosing the grade for racking and forklift loads, with a load-spreading concrete slab above.
• Prevent frost heave: long-term cooling of the ground below a store can freeze its water to considerable depth, lifting and cracking the floor. The three recognised measures are non-frost-susceptible fill, insulation that limits the advance of the freezing front, and heating the ground below the building with heater mats or ventilated floors with air ducts.

Metal (shinko) roofs and warehouses

Metal sheeting heats up quickly in the sun and expands and contracts daily, and leaks usually start at fasteners and laps. The first solution is spray polyurethane foam over the sheeting, because it bonds to the corrugated profile and seals fasteners and laps in one continuous layer, provided it is covered with a UV-resistant topcoat (acrylic, aliphatic polyurea or silicone per the data sheet), since exposed foam degrades. The second solution for new buildings is factory-insulated sandwich panels, with close attention to joint and edge details. In both cases verify the soundness and fixing of the sheeting before insulating.

Medical facilities and cleanrooms

ISO 14644-1 classifies cleanrooms into nine classes (ISO Class 1 to ISO Class 9) by the concentration of airborne particles from 0.1 to 5 micrometres. The classification concerns the air, but it imposes practical requirements on surfaces and floors: they must be smooth and seamless so they do not trap dust, floor-to-wall junctions should be coved, and they must withstand the disinfectants used in the facility. Self-levelling epoxy flooring and polyurethane systems are the usual choice.

X-ray rooms: the lead-equivalence concept only

The ability of a wall or door to attenuate X-rays is expressed as lead equivalence: the thickness of lead giving the same attenuation at a given radiation energy. A concrete wall or composite board can therefore achieve a given equivalence without containing lead of that thickness. The decisive factor in execution is continuity: any gap at board joints, around doors or at electrical penetrations defeats the shielding whatever its thickness.

QA/QC Testing Protocols on Site and in the Laboratory

The data sheet proves how the material performs in the laboratory; site tests prove that the installation achieved that performance. The table below summarises the main tests and their standards. Acceptance criteria (the numerical pass limits) are mostly not set by these standards themselves but by the project specification or the manufacturer's data sheet, and must be agreed in writing before work starts.

A practical QC sequence

1. 1

   Before supply

   Review the data sheet against the checklist above, request conformity certificates and batch numbers, and agree acceptance criteria for each test in writing.

2. 2

   Surface preparation

   Record concrete moisture, cleanliness and profile before any coating, because most adhesion failures start from an unprepared surface. Suitable equipment is covered in the academy equipment guide.

3. 3

   During application

   Log surface and air temperature and dew point, measure wet film thickness regularly, and keep samples from each batch.

4. 4

   After curing

   Measure dry film thickness using the method suited to the substrate, then holiday-test linings, then carry out pull-off tests at agreed locations and repair them afterwards.

5. 5

   Final performance test

   Flood test horizontal surfaces where the specification requires it, and document results with photos and dates in a handover file kept with the project records.

If you have a project that needs data sheets reviewed or a test plan prepared, you can request an inspection or send your question to an engineer using the form below.