Lewis Woodhouse
Hi Roy- My opinion based on experience is that depending on your roofing felt and your loft space it's self that vents are always a necessity of course they do help but they just aren't always If you find that you are having damp problems or condensation appearing on the roofing felt then these are signs that more ventilation is needed. However if you would rather be safe than sorry then soffit vents could be installed at a fairy low reasonable cost and provide air flow. Lewis Manor roofing repairs
