Demolition & Confined Spaces

What is the first consideration for any demolition project?

• AWhether the required equipment and machinery is already available on site
• BMinimising the overall cost of the demolition contract for the client
• CHazard surveys identifying asbestos, structures, services, contamination, and structural instability✓
• DThe speed at which the demolition contractor can complete the whole project

Answer: Pre-demolition surveys are essential to identify hazardous materials (asbestos, lead), active utilities, structural hazards, and environmental contaminants.

What is a confined space?

• AA space not designed for occupancy with limited access and potential for hazardous atmospheres✓
• BAny small room within a building, regardless of how it is ventilated or accessed
• CAny underground area at all, regardless of its size, access points, or ventilation
• DA closet or cupboard used for storage, which is always safe to enter without any checks

Answer: Confined spaces include tanks, vaults, chambers, and enclosed areas where oxygen-deficiency or toxic atmospheres can develop. Limited entry/exit complicates rescue.

What is required before entry to a permit-required confined space?

• AJust the verbal consent of the worker who will be entering the space, given informally on the day
• BThe worker's own common sense on the day is all that is required
• CHazard assessment, atmospheric monitoring, rescue plan, permit, and trained personnel✓
• DOnly the provision of basic personal protective equipment, without any atmospheric testing beforehand

Answer: Permit-required confined space entry requires: completed permit, atmosphere tested and acceptable, rescue equipment and personnel prepared, and competent supervision.

What are the hazards associated with asbestos in demolition?

• AOnly a minor irritant to the skin, similar to ordinary household dust
• BCompletely harmless once the building has been left vacant for more than a year
• CNo specific hazard exists provided the material is left completely undisturbed
• DInhalation causes mesothelioma, lung cancer, and asbestosis✓

Answer: Asbestos fibre inhalation causes serious lung disease. Demolition of asbestos-containing materials requires licensed contractors and specialised procedures.

When should asbestos removal occur during demolition?

• AIt does not matter at what point removal happens during the project
• BBefore any other demolition work begins✓
• CAfter the rest of the demolition work has already been fully completed
• DAt the same time as general demolition, so that both jobs finish together

Answer: Asbestos must be removed and properly disposed of BEFORE general demolition commences to prevent contamination and fibre release.

What is atmospheric monitoring in confined spaces testing for?

• AOxygen levels, toxic gases, and flammable atmospheres✓
• BTemperature and humidity levels only, to keep workers comfortable inside
• CThe speed of airflow only, to confirm that ventilation fans are switched on
• DThe moisture content of the air only, to check for potential water ingress

Answer: Testing checks: adequate oxygen (19.5%-23.5%), absence of toxic gases (H2S, CO, etc.), and absence of flammable atmospheres (LEL limits).

What is a 'Hot Work Permit'?

• APermission to carry out work on site during unusually warm summer weather
• BAuthorisation and precautions for work involving heat (welding, cutting, grinding) to prevent fires✓
• CUnnecessary for any construction task at all, regardless of the tools used
• DA type of training course that all site operatives must complete once a year

Answer: Hot Work Permits authorise high-temperature work and require: fire watch personnel, removal of combustibles, sprinklers/extinguishers ready, and post-work checks.

What should be done with utilities before demolition begins?

• AOnly the gas supply needs disconnecting; other services can safely stay connected
• BDisconnect, cap, and secure all services (gas, electricity, water, drainage) per regulations✓
• CLeft active throughout demolition for the convenience of the site team
• DUtilities do not need to be considered as part of demolition planning

Answer: All live utilities must be identified, safely disconnected, and capped to prevent fire, explosion, electrocution, and contamination during demolition.

What is a confined space rescue plan?

• AUnnecessary provided the entrant is wearing appropriate personal protective equipment
• BSimply having a qualified first aider present somewhere on the wider site
• CDocumented plan for rapid extraction of an incapacitated entrant with trained and equipped rescuers✓
• DAn optional procedure that is only written up if the client specifically requests it

Answer: Rescue plans must document: rescue method, trained rescuers, required equipment (harnesses, lines, ventilation), and coordination with emergency services.

What training is required for confined space entry personnel?

• ATraining limited to operating entry equipment, with no other topics covered
• BWhatever training all workers already receive is enough
• CHazard recognition, atmospheric testing, rescue procedures, emergency response, and permit use✓
• DGeneral site safety induction only, with no confined-space-specific content

Answer: Competent personnel must understand confined space hazards, recognise atmospheric dangers, perform testing correctly, and execute rescue procedures.

What is the purpose of a confined space entry permit?

• AAuthorise entry, confirm hazards assessed, controls implemented, and rescue available✓
• BAn optional form that adds administrative delay without improving safety in any meaningful way
• CA verbal nod from the site foreman is all that is legally required before entering a confined space
• DConfined space entry needs no formal authorisation as long as the entrant feels confident

Answer: Confined space permits document: hazard identification, atmosphere testing results, rescue plan confirmation, and authorised entrant/attendant/rescue person appointment.

What pre-demolition survey must be completed before demolition starts?

• AA quick visual walk-through by the site manager is enough to rule out hazardous materials
• BA structural photograph of the building's exterior is sufficient evidence before demolition
• CAsbestos survey mandatory; identifies asbestos-containing materials before disturbance✓
• DAsbestos was fully removed from all UK buildings decades ago, so no survey is required

Answer: Licensed asbestos survey required before demolition. Identifies ACM (asbestos-containing materials), determines encapsulation or removal requirements per regulations.

What hazards exist in confined spaces?

• AConfined space hazards build up gradually over several hours, giving ample time to react
• BDust inhalation is the only meaningful risk, since most confined spaces are well ventilated
• CConfined spaces carry no greater risk than any other enclosed room found on a typical site
• DOxygen depletion, toxic gases, engulfment, and atmospheric pressure changes; rapid incapacitation✓

Answer: Confined space hazards develop rapidly. Oxygen below 19.5% causes unconsciousness in seconds. Prohibition on entry without: atmosphere testing, rescue plan, and trained attendant.

What is atmospheric monitoring in confined spaces?

• AContinuous testing of oxygen, toxic gases, and combustible vapors before and during entry✓
• BA single test taken before entry is sufficient, with no further monitoring needed inside
• CAir conditions inside a confined space remain fixed once the initial entry check is complete
• DMonitoring equipment is only required in spaces below ground, not in elevated tanks or vessels

Answer: Continuous monitoring required: oxygen (19.5-23.5%), hydrogen sulfide (<10 ppm), carbon monoxide (<35 ppm), combustible vapors (<25% LEL). Alarms set for deviations.

What is a rescue plan for confined space entry?

• ABystanders and passing colleagues can always be relied upon to organise an effective rescue if something goes wrong
• BOnly required when the confined space in question is deeper than roughly three metres below ground level surface
• CDocument detailing rescue methods, trained personnel, equipment, and communication systems before entry✓
• DUnnecessary provided the entrant carries a mobile phone to call for help if needed

Answer: Rescue plans must identify: rescue method (tripod/harness), trained rescuers on standby, retrieval equipment tested, and communication between entrant and attendant.

What asbestos removal procedures must be followed?

• AAsbestos-containing material can be safely handled by any trained site operative without needing a specialist license
• BAsbestos can be removed using the same methods and tools as any other demolition waste
• CLicensed contractor, sealed work area, negative pressure ventilation, wet methods, and proper waste containment✓
• DSmall quantities of asbestos can legally be removed by the ordinary site team without any specialist training or license

Answer: Licensed asbestos contractor required. Procedures: work area isolation, negative pressure ventilation, wet removal methods, HEPA filtration, and certified disposal.

What is competent person role in confined space work?

• ATrained individual authorising entry, assessing hazards, ensuring monitoring, and coordinating rescue✓
• BA purely administrative title with no real safety responsibilities on a confined space job
• CAny available worker can take on the role, since competence is not a legal requirement
• DEntry can be approved by whoever is on site at the time, regardless of training or experience

Answer: Competent person must: understand confined space hazards, authorise entry, ensure atmosphere testing, verify rescue plan activation, and monitor throughout work.

What hazards develop during building demolition?

• ADust, asbestos release, structural collapse, noise, vibration, and buried hazards requiring planning✓
• BDemolition can proceed on standard risk assessments used for general site work, since the hazards are no different from routine construction activity
• CDust suppression is the main concern, so provided water spray is used continuously no separate asbestos survey or structural assessment is required
• DOnce services are disconnected and the site fenced off, demolition presents minimal further risk

Answer: Demolition hazards require: asbestos survey, structural analysis, dust suppression (water spray), noise control, vibration monitoring, and demolition sequence planning.

What is the maximum safe duration for continuous confined space entry?

• AWorkers may remain inside for as long as the task requires provided they carry a personal gas monitor, without needing a dedicated attendant outside
• BDuration is only restricted in spaces with a known history of toxic gas, while entries into spaces tested clear beforehand have no time restriction
• CEntry duration is set by the permit issuer as a single fixed 4-hour shift regardless of atmosphere, since gas testing at the start covers the whole period
• DDepends on atmosphere; limit entries, use rotation, and ensure attendant monitoring throughout✓

Answer: Continuous entry limits vary by atmosphere/conditions but typically short duration (30-60 min) with rotation, rest periods, and mandatory attendant supervision throughout.